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Frequently asked questions

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Q1: Is there really a scientific consensus on climate change?

A1: Yes. The IPCC findings of recent warming as a result of human influence are explicitly recognized as the "consensus" scientific view by the science academies of all the major industrialized countries. No scientific body of national or international standing presently rejects the basic findings of human influence on recent climate. This scientific consensus is supported by over 99% of publishing climate scientists.^[1]

Q2: How can we say climate change is real when it's been so cold in such-and-such a place?

A2: This is why it is termed "global warming", not "(such-and-such a place) warming". Even then, what rises is the average temperature over time – that is, the temperature will fluctuate up and down within the overall rising trend. To give an idea of the relevant time scales, the standard averaging period specified by the World Meteorological Organisation (WMO) is 30 years. Accordingly, the WMO defines climate change as "a statistically significant variation in either the mean state of the climate or in its variability, persisting for an extended period (typically decades or longer)."^[2]

Q3: Can't the increase of CO₂ be from natural sources, like volcanoes or the oceans?

A3: While these claims are popular among global warming skeptics,^[3]^[4] including academically trained ones,^[5]^[6] they are incorrect. This is known from any of several perspectives:

Current human emissions of CO₂ are at least 100 times larger than volcanic emissions. Measurements of CO₂ levels over the past 50 years do not show any significant rises after eruptions.^[7] This is easily seen in a graph of CO₂ concentrations over the past 50 years: the strongest eruption during the period, that of Mount Pinatubo in 1991, produced no increase in the trend.
Isotopic analysis of atmospheric carbon dioxide shows the observed change in the ratio of carbon isotopes reflects the isotopic ratios in fossil fuels.^[8]
Atmospheric oxygen content is decreasing at a rate that agrees with the amount of oxygen being used to burn fossil fuels.^[9]
If the oceans were giving up some of their carbon dioxide, their carbon dioxide concentration would have to decrease. But instead we are measuring an increase in the oceans' carbon dioxide concentration, resulting in the oceans becoming more acidic (or in other words, less basic).^[10]

Q4: I think the article is missing some things, or has some things wrong. Can I change it?

A4: Yes. Keep in mind that your points need to be based on documented evidence from the peer-reviewed literature, or other information that meets standards of verifiability, reliability, and no original research. If you do not have such evidence, more experienced editors may be able to help you find it (or confirm that such evidence does not exist). You are welcome to make such queries on the article's talk page but please keep in mind that the talk page is for discussing improvements to the article, not discussing the topic. There are many forums that welcome general discussions of global warming, but the article talk page is not such a forum.

Q5: Why haven't the graphs been updated?

A5: Two reasons:

There are many images used in the articles related to global warming, and there are many reasons why they may not be updated with the latest data. Some of the figures, like the Global Warming Map, are static, meaning that they are intended to show a particular phenomenon and are not meant to be updated frequently or at all. Others, like the Instrumental Temperature Record and Northern Hemisphere Sea Ice Extent Anomalies, use yearly data and thus are updated once per year—usually in mid- to late-January, depending upon when the data is publicly released, and when a volunteer creates the image. Still others, like Mauna Loa Carbon Dioxide, use monthly data. These are updated semi-regularly.
However, just because an image is 6 months or a year old does not mean it is useless. Robert A. Heinlein is credited with saying, "Climate is what you expect, weather is what you get", meaning that climate is defined as a long-term average of weather, usually about 30 years. This length was chosen to eliminate the year-to-year variations.^[11] Thus, in terms of climate change, any given year's data is of little import.

Q6: Isn't climate change "just a theory"?

A6: People who say this are abusing the word "theory" by conflating its common meaning with its scientific meaning. In common usage, "theory" can mean a hunch or guess, but a scientific theory, roughly speaking, means a coherent set of explanations that is compatible with observations and that allows predictions to be made. That the temperature is rising is an observation. An explanation for this (also known as a hypothesis) is that the warming is primarily driven by greenhouse gases (such as CO₂ and methane) released into the atmosphere by human activity. Scientific models have been built that predict the rise in temperature and these predictions have matched observations. When scientists gain confidence in a hypothesis because it matches observation and has survived intense scrutiny, the hypothesis may be called a "theory". Strictly speaking, scientific theories are never proven, but the degree of confidence in a theory can be discussed. The scientific models now suggest that it is "extremely likely" (>95%) to "virtually certain" (>99%) that the increases in temperature have been caused by human activity as discussed in the IPCC Fifth Assessment Report. Global warming via greenhouse gases by human activity is a theory (in the scientific sense), but it is most definitely not just a hunch or guess.

Q7: Does methane cause more warming than CO₂?

A7: It's true that methane is more potent molecule for molecule. But there's far less of it in the atmosphere, so the total effect is smaller. The atmospheric lifetime of methane (about 10 years) is a lot shorter than that of CO₂ (hundreds to thousands of years), so when methane emissions are reduced the concentration in the atmosphere soon falls, whereas CO₂ accumulates in the atmosphere over long periods. For details see the greenhouse gas and global warming potential articles.

Q8: How can you say there's a consensus when lists of "skeptical scientists" have been compiled?

A8: Consensus is not the same as unanimity, the latter of which is impractical for large groups. Over 99% of publishing climate scientists agree on anthropogenic climate change.^[1] This is an extremely high percentage well past any reasonable threshold for consensus. Any list of "skeptical scientists" would be dwarfed by a comparably compiled list of scientists accepting anthropogenic climate change.

Q9: Did climate change end in 1998?

A9: One of the strongest El Niño events in the instrumental record occurred during late 1997 through 1998, causing a spike in global temperature for 1998. Through the mid-late 2000s this abnormally warm year could be chosen as the starting point for comparisons with later years in order to produce a cooling trend; choosing any other year in the 20th century produced a warming trend. This no longer holds since the mean global temperatures in 2005, 2010, 2014, 2015 and 2016 have all been warmer than 1998.^[12] More importantly, scientists do not define a "trend" by looking at the difference between two given years. Instead they use methods such as linear regression that take into account all the values in a series of data. The World Meteorological Organisation specifies 30 years as the standard averaging period for climate statistics so that year-to-year fluctuations are averaged out;^[2] thus, 10 years isn't long enough to detect a climate trend.

Q10: Wasn't Greenland much warmer during the period of Norse settlement?

A10: Some people assume this because of the island's name. In fact the Saga of Erik the Red tells us Erik named the new colony Greenland because "men will desire much the more to go there if the land has a good name."^[13] Advertising hype was alive and well in 985 AD.

While much of Greenland was and remains under a large ice sheet, the areas of Greenland that were settled by the Norse were coastal areas with fjords that, to this day, remain quite green. You can see the following images for reference:

A map of the Eastern Settlement
A satellite image of that area today
A map of the Western Settlement
A satellite image of that area today
A zoom in on the general area where the Brattahlíð (Erik the Red's farm) and Garðar farms were located

Q11: Are the IPCC reports prepared by biased UN scientists?

A11: The IPCC reports are not produced by "UN scientists". The IPCC does not employ the scientists who generate the reports, and it has no control over them. The scientists are internationally recognized experts, most with a long history of successful research in the field. They are employed by various organizations including scientific research institutes, agencies like NASA and NOAA, and universities. They receive no extra pay for their participation in the IPCC process, which is considered a normal part of their academic duties.

Q12: Hasn't global sea ice increased over the last 30 years?

A12: Measurements show that it has not.^[14] Claims that global sea ice amounts have stayed the same or increased are a result of cherry picking two data points to compare, while ignoring the real (strongly statistically significant) downward trend in measurements of global sea ice amounts.

Arctic sea ice cover is declining strongly; Antarctic sea ice cover has had some much smaller increases, though it may or may not be thinning, and the Southern Ocean is warming. The net global ice-cover trend is clearly downwards.

Q13: Weren't scientists telling us in the 1970s that the Earth was cooling instead of warming?

A13: They weren't – see the article on global cooling. An article in the Bulletin of the American Meteorological Society has reviewed the scientific literature at that time and found that even during the 1970s the prevailing scientific concern was over warming.^[15] The common misperception that cooling was the main concern during the 1970s arose from a few studies that were sensationalized in the popular press, such as a short nine-paragraph article that appeared in Newsweek in 1975.^[16] (Newsweek eventually apologized for having misrepresented the state of the science in the 1970s.)^[17] The author of that article has repudiated the idea that it should be used to deny global warming.^[18]

Q14: Doesn't water vapour cause 98% of the greenhouse effect?

A14: Water vapour is indeed a major greenhouse gas, contributing about 36% to 70% (not 98%) of the total greenhouse effect. But water vapour has a very short atmospheric lifetime (about 10 days), compared with decades to centuries for greenhouse gases like CO₂ or nitrous oxide. As a result it is very nearly in a dynamic equilibrium in the atmosphere, which globally maintains a nearly constant relative humidity. In simpler terms, any excess water vapour is removed by rainfall, and any deficit of water vapour is replenished by evaporation from the Earth's surface, which literally has oceans of water. Thus water vapour cannot act as a driver of climate change.

Rising temperatures caused by the long-lived greenhouse gases will however allow the atmosphere to hold more vapour. This will lead to an increase in the absolute amount of water vapour in the atmosphere. Since water vapour is itself a greenhouse gas, this is an example of a positive feedback. Thus, whereas water vapour is not a driver of climate change, it amplifies existing trends.

Q15: Is the fact that other solar system bodies are warming evidence for a common cause (i.e. the sun)?

A15: While some solar system bodies show evidence of local or global climate change, there is no evidence for a common cause of warming.

A 2007 National Geographic article described the views of Khabibullo Abdusamatov, who claims that the sun is responsible for global warming on both Earth and Mars.^[19] Abdussamatov's views have no support in the scientific community, as the second page of the National Geographic article makes clear: "'His views are completely at odds with the mainstream scientific opinion,' said Colin Wilson, a planetary physicist at England's Oxford University. [...] Amato Evan, a climate scientist at the University of Wisconsin, Madison, added that 'the idea just isn't supported by the theory or by the observations.'"^[20]
There is no reliable source claiming that Jupiter is warming. However, observations of the Red Spot Jr. storm suggest Jupiter could be in a period of global climate change.^[21]^[22] This is hypothesized to be part of an approximately 70 year global climate cycle, characterized by the relatively rapid forming and subsequent slow erosion and merging of cyclonic and anticyclonic vortices that help transfer heat between Jupiter's poles and equator. The cycle works like this: As the vortices erode, heat exchange is reduced; this makes the poles cool down and the equatorial region heat up; the resulting temperature difference destabilizes the atmosphere, leading to the creation of new vortices.^[23]^[24]
Pluto has an extremely elliptical orbit with a period of about 248 years. Data are sparse, but two data points from 1988 and 2002 indirectly suggest that Pluto warmed between those two dates.^[25] Pluto's temperature is heavily influenced by its elliptical orbit – it was closest to the sun in 1989 and has slowly receded since. Because of thermal inertia, it is expected to warm for a while after it passes perihelion (similar to how a sunny day's warmest temperatures happen during the afternoon instead of right at noon). No other mechanism has so far been seriously suggested. Here is a reasonable summary, and this paper discusses how the thermal inertia is provided by sublimation and evaporation of parts of Pluto's atmosphere. A more popular account is here and in Wikipedia's own article.

Q16: Do scientists support climate change just to get more money?

A16: No,

Scientists participate in international organizations like the IPCC as part of their normal academic duties. They do not receive any extra compensation beyond possibly for direct expenses.
Scientific grants do not usually award any money to a scientist personally, only towards the cost of his or her scientific work.
There is not a shortage of useful things that scientists could study if they were not studying global warming.
- Understanding our climate system better brings benefits independent of global warming. For instance, more accurate weather predictions save a lot of money (on the order of billions of dollars a year), and everyone from insurance agents to farmers wants climate data.^[26]^[27] Scientists could get paid to study climate even if global warming did not exist.

Q17: Doesn't the climate vary even without human activity?

A17: It does, but the fact that natural variation occurs does not mean that human-induced change cannot also occur. Climate scientists have extensively studied natural causes of climate change (such as orbital changes, volcanism, and solar variation) and have ruled them out as an explanation for the current temperature increase. Human activity is the cause at the 95 to 99 percent confidence level (see the IPCC Fifth Assessment Report for details). The high level of certainty in this is important to keep in mind to spot mention of natural variation functioning as a distraction.

Q18: Should we include the view that climate change will lead to planetary doom or catastrophe?

A18: This page is about the science of climate change. It doesn't talk about planetary doom or catastrophe. For a technical explanation, see catastrophic climate change, and for paleoclimatic examples see PETM and great dying.

Q19: Is an increase in global temperature of, say, 3 degrees Celsius (5.4 degrees Fahrenheit) important?

A19: Though it may not sound like much, a global temperature rise of 3 degrees Celsius (5.4 degrees Fahrenheit) is huge in climate terms. For example, the sea level rise it would produce would flood coastal cities around the world, which include most large cities.

Earth's climate has varied significantly over geological ages. The question of an "optimal temperature" makes no sense without a clear optimality criterion. Over geological time spans, ecosystems adapt to climate variations. But global climate variations during the development of human civilization (i.e. the past 12,000 years) have been remarkably small. Human civilization is highly adapted to the current stable climate. Agricultural production depends on the proper combination of soil, climate, methods, and seeds. Most large cities are located on the coast, and any significant change in sea level would strongly affect them. Migration of humans and ecosystems is limited by political borders and existing land use. In short, the main problem is not the higher absolute temperature but the massive and unprecedentedly fast change in climate and the related effects on human societies. The IPCC AR6 WG2 report has a detailed discussion of the effects of rapid climate change.

Q20: Why are certain proposals to change the article discarded, deleted, or ignored? Who is/was Scibaby?

A20: Scibaby is/was a long term abusive sock-master (or coordinated group of sock masters) who has created 1,027 confirmed sock puppets, another 167 suspected socks, and probably many untagged or unrecognized ones. This page lists some recent creations. His modus operandi has changed over time, but includes proposing reasonably worded additions on the talk page that only on close examination turn out to be irrelevant, misinterpreted, or give undue weight to certain aspects. Scibaby is banned, and Scibaby socks are blocked as soon as they are identified. Some editors silently revert his additions, per WP:DENY, while others still assume good faith even for likely socks and engage them.

Q21: What about this really interesting recent peer-reviewed paper I read or read about, that says...?

A21: There are hundreds of peer-reviewed papers published every month in respected scientific journals such as Geophysical Research Letters, the Journal of Climate, and others. We can't include all of them, but the article does include references to individual papers where there is consensus that they best represent the state of the relevant science. This is in accordance with the "due weight" principle (WP:WEIGHT) of the Neutral point of view policy and the "Wikipedia is not an indiscriminate collection of information" principle (WP:IINFO) of the What Wikipedia is not policy.

Q22: Why does the article define "climate change" as a recent phenomenon? Hasn't the planet warmed and cooled before?

A22: Yes, the planet has warmed and cooled before. However, the term "climate change" without further qualification is widely understood to refer to the recent episode and often explicitly connected with the greenhouse effect. Per WP:COMMONNAME, we use the term in this most common meaning. The article Climate variability and change deals with the more general concept.

Q23: Did the CERN CLOUD experiment prove that climate change is caused not by human activity but by cosmic rays?

A23: No. For cosmic rays to be causing global warming, all of the following would have to be true, whereas only the italicized one was tested in the 2011 experiment:^[28]

Solar magnetic field must be getting stronger
The number of cosmic rays reaching Earth must be dropping
Cosmic rays must successfully seed clouds, which requires:

Cosmic rays must trigger aerosol (liquid droplet) formation,
These newly-formed aerosols must grow sufficiently through condensation to form cloud-condensation nuclei (CCN),
The CCN must lead to increased cloud formation, and
Cloud cover on Earth must be declining.

Perhaps the study's lead author, Jasper Kirkby, put it best: "...it [the experiment] actually says nothing about a possible cosmic-ray effect on clouds and climate, but it's a very important first step."^[29]

Q24: I read that something can't fix climate change. Is this true?

A24: Yes, this is true for all plausible single things including: "electric cars", "planting trees", "low-carbon technology", "renewable energy", "Australia", "capitalism", "the doom & gloom approach", "a Ph.D. in thermodynamics". Note that it is problematic to use the word "fix" regarding climate change, as returning the climate to its pre-industrial state currently appears to be feasible only over a timeframe of thousands of years. Current efforts are instead aimed at mitigating (meaning limiting) climate change. Mitigation is strived for through the combination of many different things. See Climate change mitigation for details.

References

^ ^a ^b Powell, James (20 November 2019). "Scientists Reach 100% Consensus on Anthropogenic Global Warming". Bulletin of Science, Technology & Society. 37 (4): 183–184. doi:10.1177/0270467619886266. S2CID 213454806. Retrieved 15 November 2020.
^ ^a ^b "Commission for Climatology Frequently Asked Questions". World Meteorological Organization. Archived from the original on 5 May 2020. Retrieved 14 July 2020.
^ Harris, Tom. "Scientists who work in the fields liberal arts graduate Al Gore wanders through contradict his theories about man-induced climate change". National Post. Archived from the original on 30 August 2011. Retrieved 11 January 2009 – via Solid Waste & Recycling. {{cite web}}: |archive-date= / |archive-url= timestamp mismatch; 4 February 2012 suggested (help)
^ Arriola, Benj. "5 Good Arguments Why GlobalWarming is NOT due to Man-made Carbon Dioxide". Global Warming Awareness Blog. Retrieved 11 January 2009.
^ Ahlbeck, Jarl. "Increase of the Atmospheric Carbon Dioxide Concentration due to Ocean Warming". Retrieved 11 January 2009.
^ Kirby, Simon (11 April 2007). "Top scientist debunks global warming". Herald Sun. Retrieved 11 January 2009.
^ Brahic, Catherine (16 May 2007). "Climate myths: Human CO2 emissions are too tiny to matter". New Scientist. Retrieved 11 January 2009.
^ "More Notes on Global Warming". Physics Today. May 2005. Retrieved 10 September 2007.
^ Battle, M.; et al. (2000). "Global Carbon Sinks and Their Variability Inferred from Atmospheric O2 and d13C". Science. 287 (5462): 2467–2470. doi:10.1126/science.287.5462.2467.
^ The Royal Society (2005). "Ocean acidification due to increasing atmospheric carbon dioxide". Retrieved 9 May 2012.
^ "Met Office: Climate averages". Met Office. Archived from the original on 24 February 2009. Retrieved 23 January 2009.
^ Climate Central (18 January 2017). "2016 Was the Hottest Year on Record". Climate Central. Retrieved 1 February 2017.
^ The Saga of Erik the Red, 1880, English translation by J. Sephton, from the original Eiríks saga rauða.
^ "Cold Hard Facts". Tamino. 8 January 2009. Retrieved 21 January 2009.^{[dead link]}
^ Peterson, T. C.; et al. (2008). "The Myth of the 1970s Global Cooling Scientific Consensus". Bulletin of the American Meteorological Society. 89 (9): 1325. Bibcode:2008BAMS...89.1325P. doi:10.1175/2008BAMS2370.1.
^ Gwynne, Peter (28 April 1975). "The Cooling World". Newsweek. p. 64.
^ Verger, Rob (23 May 2014). "Newsweek Rewind: Debunking Global Cooling". Newsweek.
^ Gwynne, Peter (21 May 2014). "My 1975 'Cooling World' Story Doesn't Make Today's Climate Scientists Wrong". insidescience.org.
^ Ravilious, Kate (28 February 2007). "Mars Melt Hints at Solar, Not Human, Cause for Warming, Scientist Says". National Geographic News. Archived from the original on 2 March 2007. Retrieved 6 March 2008.
^ Ravilious, Kate (28 February 2007). "Mars Melt Hints at Solar, Not Human, Cause for Warming, Scientist Says (page 2)". National Geographic News. Archived from the original on 2 March 2007. Retrieved 6 March 2008.
^ Marcus, Philip; Shetty, Sushil; Asay-Davis, Xylar (November 2006). Velocities and Temperatures of Jupiter's Great Red Spot and the New Red Oval and Implications for Global Climate Change. American Physical Society. Retrieved 9 May 2007.
^ Goudarzi, Sara (4 May 2006). "New Storm on Jupiter Hints at Climate Change". Space.com. Retrieved 9 May 2007.
^ Philip, Marcus S. (22 April 2004). "Prediction of a global climate change on Jupiter" (PDF). Nature. 428 (6985): 828–831. Retrieved 9 May 2007.
^ Yang, Sarah (21 April 2004). "Researcher predicts global climate change on Jupiter as giant planet's spots disappear". University of California, Berkeley. Retrieved 9 May 2007.
^ Elliot, J. L.; et al. (10 July 2003). "The recent expansion of Pluto's atmosphere". Nature (424): 165–168. doi:10.1038/nature01762.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ Foerster, Jim. "What's The Difference Between Private Weather Companies And The National Weather Service?". Forbes.
^ Eilts, Mike (27 November 2018). "The Role of Weather—and Weather Forecasting—in Agriculture". DTN.
^ "What do the CERN experiments tell us about global warming?". Skeptical Science. 2 September 2011.
^ Brumfiel, Geoff (23 August 2011). "Cloud Formation May Be Linked to Cosmic Rays". Scientific American.

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Sarah McBroom (March 27, 2007). "Conservapedia.com -- an encyclopedic message from the right". Scripps Howard News Service.
Michael Booth (April 30, 2007). "Grading Wikipedia". The Denver Post.
"Topics that spark Wikipedia 'edit wars' revealed". BBC News. July 18, 2013.
Cary Institute of Ecosystem Studies (August 15, 2015). "On Wikipedia, politically controversial science topics vulnerable to information sabotage". Science Daily.
"The guardians of Wikipedia's climate page: An intensely devoted core keeps a bastion of climate science honest". Mashable. November 11, 2020.
"Climate change: Conspiracy theories found on foreign-language Wikipedia". BBC. November 18, 2021.
Marco Silva (December 24, 2021). "Climate change: Small army of volunteers keeping deniers off Wikipedia". BBC.
Olivia Steiert (September 9, 2024). "Declaring crisis? Temporal constructions of climate change on Wikipedia". Public Understanding of Science.

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RM, Global warming → Climate change, Moved, 21 August 2020, discussion

This article has been viewed enough times in a single year to make it into the Top 50 Report annual list. This happened in 2007 and 2008.

This article has been viewed enough times in a single week to appear in the Top 25 Report 5 times. The weeks in which this happened:

This article was reviewed by The Denver Post on April 30, 2007.
Comments: "a great primer on the subject", "Following the links takes the interested reader into greater and greater depth, probably further than any traditional encyclopedia I've seen", pleasantly surprised how the main articles "stick to the science and avoid confusing the reader with political controversy.", wishes Wikipedia offered better links to basic weather science. Please examine the findings.
For more information about external reviews of Wikipedia articles and about this review in particular, see this page.

On 3 August 2020, it was proposed that this article be moved from Global warming to Climate change. The result of the discussion was moved.

Section sizes

Section size for Climate change (49 sections)
Section name	Byte count	Section total
(Top)	14,732	14,732
Terminology	3,667	3,667
Global temperature rise	69	27,139
Temperature records prior to global warming	2,641	2,641
Warming since the Industrial Revolution	10,805	17,366
Differences by region	6,561	6,561
Future global temperatures	7,063	7,063
Causes of recent global temperature rise	2,597	33,919
Greenhouse gases	10,981	10,981
Land surface changes	3,666	3,666
Other factors	22	16,675
Aerosols and clouds	5,534	5,534
Solar and volcanic activity	4,997	4,997
Climate change feedbacks	6,122	6,122
Modelling	4,013	4,013
Impacts	290	28,530
Environmental effects	4,587	4,587
Tipping points and long-term impacts	5,835	5,835
Nature and wildlife	7,139	7,139
Humans	1,903	10,679
Health and food	2,868	2,868
Livelihoods and inequality	3,049	3,049
Climate migration	2,859	2,859
Reducing and recapturing emissions	4,062	20,288
Clean energy	8,135	8,135
Energy conservation	1,719	1,719
Agriculture and industry	3,453	3,453
Carbon dioxide removal	2,919	2,919
Adaptation	7,784	7,784
Policies and politics	2,381	15,593
Policy options	1,583	3,848
Climate justice	2,265	2,265
International climate agreements	6,011	6,011
National responses	3,353	3,353
Society	14	8,140
Denial and misinformation	2,550	2,550
Public awareness and opinion	4,008	5,576
Climate movement	1,568	1,568
History	61	11,181
Early discoveries	6,184	6,184
Development of a scientific consensus	4,936	4,936
See also	332	332
References	35	104,619
Sources	366	104,584
IPCC reports	5,383	5,383
Other peer-reviewed sources	47,096	47,096
Books, reports and legal documents	29,866	29,866
Non-technical sources	21,873	21,873
External links	1,161	1,161
Total	281,098	281,098

Archives

Index 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
11, 12, 13, 14, 15, 16, 17, 18, 19, 20
21, 22, 23, 24, 25, 26, 27, 28, 29, 30
31, 32, 33, 34, 35, 36, 37, 38, 39, 40
41, 42, 43, 44, 45, 46, 47, 48, 49, 50
51, 52, 53, 54, 55, 56, 57, 58, 59, 60
61, 62, 63, 64, 65, 66, 67, 68, 69, 70
71, 72, 73, 74, 75, 76, 77, 78, 79, 80
81, 82, 83, 84, 85, 86, 87, 88, 89, 90
91, 92, 93, 94, 95, 96

/Terminology section /General discussion

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Semi-protected edit request on 14 October 2024

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Different regions may experience better or worse growing conditions for crops as a result of climate change. Temperature, rainfall, and frost-free days, for example, are all increasing the length of the growing season in practically every state. Longer growing seasons can benefit and hurt food production. Some farmers may be able to plant longer-maturing crops or more crop cycles entirely, when others may require additional rainfall during a longer, hotter growing season. Summiaarif (talk) 01:47, 14 October 2024 (UTC)[reply]

Not done: it's not clear what changes you want to be made. Please mention the specific changes in a "change X to Y" format and provide a reliable source if appropriate. JTP ^{(talk • contribs)} 02:28, 14 October 2024 (UTC)[reply]

Wildfires

In the second paragraph of the lead, the second sentence states among other things that 'wildfires are becoming more common. ' Two sources are cited, one about wildfires. ^[1] While the idea behind the claim is correct, the claim itself is false. The IPCC source states that ' Climate change is playing an increasing role in determining wildfire regimes alongside human activity (medium confidence)'. This is not the same as wildfires becoming more common. Actually, two sentences later the IPCC states 'Global land area burned has declined in recent decades, mainly due to less burning in grasslands and savannahs (high confidence). ' Instead of using a blanket claim about all wildfires, I propose that we focus on the thing that the IPCC actually says. The source states that 'future climate variability [is] expected to enhance the risk and severity of wildfires in many biomes such as tropical rainforests (high confidence). ' This is a nice high confidence claim that illustrates the global warming-induced threat of wildfires.

Did you check the updated IPCC report, AR6 WG2 p.9: Observed increases in areas burned by wildfires have been attributed to human-induced climate change in some regions (medium to high confidence).? Bogazicili (talk) 15:17, 19 October 2024 (UTC)[reply]

Good point, it's important to check their latest update. This particular statement is in agreement with their 2017 report, in that some regions have more (and/or more severe) wildfires because of climate change. The 2022 report does not give a blanket statement about wildfires in general. Panoramics (talk) 15:55, 22 October 2024 (UTC)[reply]

However, they do say that further global warming will increase wildfires. For example, at page 55 of the technical summary of AR6 WG2, it says 'At a global warming of 2°C with associated changes in precipitation global land area burned by wildfire is projected to increase by 35% (medium confidence).' Panoramics (talk) 16:26, 22 October 2024 (UTC)[reply]

Carbon capture rates for CCS

Hi everyone. I have a few proposals regarding statements on carbon capture and storage in this article. Here's my first proposal. We have an unsourced sentence that says:

Where energy production or CO₂-intensive heavy industries continue to produce waste CO₂, the gas can be captured and stored instead of released to the atmosphere.

I propose changing it to:

Where energy production or CO₂-intensive heavy industries continue to produce waste CO₂, technology can sometimes be used to capture and store most of the gas instead of releasing it to the atmosphere.^[2]

As explained in the World Resources Institute source, "today’s carbon capture systems do not capture 100% of emissions. Most are designed to capture 90%, but reported capture rates are lower in some cases." Additionally, it is not economically or geologically feasible to deploy CCS at all or even most facilities. There are 2,400 coal power plants in the world and thus far we have managed to add CCS to four of them. Clayoquot (talk | contribs) 21:41, 24 October 2024 (UTC)[reply]

Done. Clayoquot (talk | contribs) 20:30, 30 October 2024 (UTC)[reply]

References

^ IPCC SRCCL 2019, p. 45: "Climate change is playing an increasing role in determining wildfire regimes alongside human activity (medium confidence), with future climate variability expected to enhance the risk and severity of wildfires in many biomes such as tropical rainforests (high confidence)."
^ Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute.

Scale of CCS

The article currently says:

Although its current use is limited in scale and expensive,^[1] carbon capture and storage (CCS) may be able to play a significant role in limiting CO₂ emissions by mid-century.^[2]

I feel this sentence could use some attention for neutrality, to accurately reflect the expert consensus on realistic levels of expectations for CCS. The IEA describes "excessive expectations and reliance" on CCS and direct air capture as a common misconception.^[3] By mid-century, it envisions CCS and direct air capture to mitigate 8% of energy sector emissions. The current pace of deployment of CCS is nowhere near meeting even that low target. The IPCC stated in 2022 that “implementation of CCS currently faces technological, economic, institutional, ecological-environmental and socio-cultural barriers.”^[4]^: 28

The current sentence comes across as optimistic, in part because of the "Although..." construction which "can have the effect of calling the validity of the first statement into question while giving undue weight to the credibility of the second" (MOS:EDITORIAL). I'm not sure if the reader will understand what "currently limited in scale" means. CCS is currently capturing one one thousandth of anthropogenic GHG emissions.

I propose changing it to:

Carbon capture and storage (CCS) has a small but critical role in reducing emissions.^[5]^[6]^: 28 It is relatively expensive^[7]^: 38 and is in operation at only 44 plants as of 2024.^[8]

(I will make the citation formatting consistent with article style). Courtesy pings to Dtetta and Femke who were involved in this sentence. Clayoquot (talk | contribs) 01:05, 25 October 2024 (UTC)[reply]

I think this goes in the right direction: I don't think "significant" is really justified based on current thinking. I have three qualms with the new proposal.

The WRI source says it "may" have a small but critical role
The IPCC says "CCS is an option .. ", again not saying it is definitely critical

I further doubt people understand what share of power is produced by 44 plants (0.1%, 5%?). We could be more vague here, to avoid maintenance issues.

I showed this proposal to someone in my team to explain how Wikipedia discussion works, and he noted that the 42 of the 44 plants are CCUS plants (so frequently used for enhanced oil recovery), which makes this feel too optimistic. —Femke 🐦 (talk) 17:59, 30 October 2024 (UTC)[reply]

Thanks for looking into this and for engaging your team.

The IPCC uses the word critical on p. 28: ...as well as in cement and chemicals production, where it is a critical mitigation option. Later on p. 104 it says that for industry, alternatives to CCS are difficult to represent in models therefore the need for CCS may be overestimated. This may be justification for using a softer phrasing. We could copy from the WRI since it's CC-BY and say "could have a critical but limited role" - would that work?
Regarding 44 plants and the share of power produced by them, it's even worse than you think. Most of these plants are not power plants; the number of power plants using CCS is 5 (until this year it wavered between 1 and 2, and then China went and opened 3). Maybe instead of giving a number of plants we should say that CCS currently captures one thousandth of anthropogenic greenhouse gas emissions - is this clearer?
Regarding the fact that CCS usually means enhanced oil recovery, yep. And this is yet another reason to doubt the idea of CCS playing a significant role in limiting CO2 emissions by mid-century.

Clayoquot (talk | contribs) 19:06, 30 October 2024 (UTC)[reply]

Much better, yes! Only a prose quabble left: I'd try to avoid the word anthropogenic. Instead, we could leave it out or say "human-made". —Femke 🐦 (talk) 19:24, 30 October 2024 (UTC)[reply]

Done, thanks! Clayoquot (talk | contribs) 20:25, 30 October 2024 (UTC)[reply]

References

^ IPCC SR15 Ch4 2018, pp. 326–327; Bednar, Obersteiner & Wagner 2019; European Commission, 28 November 2018, p. 188
^ Bui et al. 2018, p. 1068.
^ "Executive summary – The Oil and Gas Industry in Net Zero Transitions – Analysis". IEA. Retrieved 2024-09-19.Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License
^ IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.
^ Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute. Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License
^ IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.
^ IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.
^ "Global Status Report 2024". Global CCS Institute. pp. 57–58. Retrieved 2024-10-19. The report lists 50 facilities, of which 3 are direct air capture facilities and 3 are transport/storage facilities

Carbon sequestration section

The Carbon sequestration section has contents that describe carbon dioxide removal and carbon capture and storage. These three concepts are often confused. The vast majority of carbon sequestration happens through spontaneous, non-anthropogenic processes that have been going on for hundreds of millions of years and will continue if we just leave the forests alone. Most of the content in this section is about human activity that aims to increase the amount of carbon that is sequestered, i.e. carbon dioxide removal. There is also some content on carbon capture and storage, which technically involves sequestration but is usually deployed in processes that desequester more carbon than they sequester.

I propose 1) Retitling this section as "Carbon dioxide removal" and 2) Moving the two sentences on CCS to the end of the first paragraph in the "Clean energy" section. Clayoquot (talk | contribs) 20:11, 25 October 2024 (UTC)[reply]

Done. Clayoquot (talk | contribs) 20:36, 30 October 2024 (UTC)[reply]

Paper about our work & suggestions

A paper by Olivia Steiert came out on the work we do here, analysing how our group dynamics and our interpretation of policies and guidelines resulted in the current article.

The paper analyses whether we consider climate change as an event (vs process), and if we call it a crisis. It's somewhat critical of us doing neither sufficiently clearly. The paper doesn't give that many pointers how we could achieve this however. We've made progress over the last 6 years in changing the article to be more about climate change now, rather than climate change in the future, but I wonder if there is more to do here. (changing the crisis framing is a discussion I won't reopen). If there are no objections, I might send Steiert an email asking her to join us. In the meantime, I'm suggesting two changes in the lead

The current rise in global average temperature is primarily caused by humans burning fossil fuels ~~since the Industrial Revolution~~ -->

Amplified warming in the Arctic has contributed to thawing permafrost, retreat of glaciers and sea ice decline --> something in the present tense. I'd suggest leaving out polar amplification too. The quote doesn't fully capture this sentence anyway, and the source doesn't make the connection between polar amplification and these specific impacts. —Femke 🐦 (talk) 19:44, 30 October 2024 (UTC)[reply]

Thanks for sharing this, interesting article. The study uses the May 2022 version of this article, I wonder what she'd think of the current version.

As for the sentence, The current rise in..., I believe we had added "since the Industrial Revolution" to clarify what is meant by current. Bogazicili (talk) 17:50, 31 October 2024 (UTC)[reply]

Upon reflection, I'd like to keep since the Industrial Revolution. One of the criticism in the article is that we are vague in terms of our tenses. When things happened, are happening, or will happen. (Why is it so hard to arrive at a clear understanding of when climate change is happening and why do temporal constructions of this event vary so broadly)

since the Industrial Revolution gives precision and clarity to that sentence. I think it accurately describes rough timescale of human-induced climate change.

Other overview sources might say things like The industrial activities that our modern civilization depends upon have raised atmospheric carbon dioxide levels by nearly 50% since 1750[1]

If you click Industrial Revolution, it largely matches with above: Beginning in Great Britain, the Industrial Revolution spread to continental Europe and the United States, from around 1760 to about 1820–1840. Bogazicili (talk) 14:44, 1 November 2024 (UTC)[reply]

My thinking here is that "since the industrial revolution" may be a bit misleading, in the sense that most warming really happened in the last 50 years, rather than over such a long period of time. I'm also appreciating the simplicity of the POTD description below, and would like to move away from a WP:seaofblue in terms of number of links. —Femke 🐦 (talk) 17:13, 1 November 2024 (UTC)[reply]

Article housekeeping

Thanks Femke for removing unused references and other tidying. I could pitch in to help with that kind of thing for an hour or two this week. What else needs to be done? Clayoquot (talk | contribs) 02:26, 31 October 2024 (UTC)[reply]

Just to let you know, I intend to clean up after myself, but got sidetracked. For the areas I edited, some of the citations aren't to chapters but to overall IPCC reports. I'll be fixing those. Bogazicili (talk) 16:54, 31 October 2024 (UTC)[reply]

Thanks Bogazicili!

In terms of housekeeping, I try to do the following every one/two years:

See if overcitation has slipped in, which is often a red flag for text-source integrity issues. One example is overcitation after "Smaller contributions come from black carbon, organic carbon from combustion of fossil fuels and biofuels, and from anthropogenic dust", which has 6 sources. (I you could help here!)
Check if jargon such as anthropogenic has slipped back in, and reword using plain English
Reread the article, and check if there is text-source integrity for surprising statements
Reread the article, and update numbers which need updating.

—Femke 🐦 (talk) 17:19, 1 November 2024 (UTC)[reply]

Not that big of an issue, but the source formatting is also slightly messy and inconsistent in places (e.g. Harvnb is used for most things but not all, some things are missing various fields, etc). Sgubaldo (talk) 19:17, 1 November 2024 (UTC)[reply]

Wow, that's a lot of work that you've been doing regularly! I'll take on the overcitation thing. Will indicate here when I've finished checking. Clayoquot (talk | contribs) 19:42, 1 November 2024 (UTC)[reply]

Featured picture scheduled for POTD

Hello! This is to let editors know that File:1880- Global surface temperature - heat map animation - NASA SVS.webm, a featured picture used in this article, has been selected as the English Wikipedia's picture of the day (POTD) for November 12, 2024. A preview of the POTD is displayed below and can be edited at Template:POTD/2024-11-12. For the greater benefit of readers, any potential improvements or maintenance that could benefit the quality of this article should be done before its scheduled appearance on the Main Page. If you have any concerns, please place a message at Wikipedia talk:Picture of the day. Thank you! — Amakuru (talk) 10:18, 1 November 2024 (UTC)[reply]

Contemporary climate change involves rising global temperatures and significant shifts in Earth's weather patterns. Climate change is driven by emissions of heat-trapping greenhouse gases such as carbon dioxide and methane. Emissions come mostly from burning fossil fuels (coal, oil and natural gas), and also from agriculture, forest loss, cement production and steel making. Climate change causes sea level rise, glacial retreat and desertification, and intensifies heat waves, wildfires and tropical storms. These effects of climate change endanger food security, freshwater access and global health. Climate change can be limited by using low-carbon energy sources such as wind and solar energy, forestation, and shifts in agriculture. Adaptations such as coastline protection cannot by themselves avert the risk of severe, pervasive and irreversible impacts. Limiting global warming in line with the goals of the Paris Agreement requires reaching net-zero emissions by 2050. This NASA animation shows global surface temperature changes from 1880 to 2023. The colour blue denotes cooler temperatures and red denotes warmer temperatures.

Video credit: NASA; visualization by Mark SubbaRao

Recently featured:

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[:2-31] Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute.

[32] IPCC SR15 Ch4 2018, pp. 326–327; Bednar, Obersteiner & Wagner 2019; European Commission, 28 November 2018, p. 188

[FOOTNOTEBuiAdjimanBardowAnthony20181068-33] Bui et al. 2018, p. 1068.

[:4-34] "Executive summary – The Oil and Gas Industry in Net Zero Transitions – Analysis". IEA. Retrieved 2024-09-19.Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License

[:02-35] IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.

[:22-36] Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute. Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License

[:0-37] IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.

[:1-38] IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.

[:21-39] "Global Status Report 2024". Global CCS Institute. pp. 57–58. Retrieved 2024-10-19. The report lists 50 facilities, of which 3 are direct air capture facilities and 3 are transport/storage facilities

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