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|q=Q22: What about this really interesting recent peer reviewed paper I read or read about, that says...? |q=Q22: What about this really interesting recent peer reviewed paper I read or read about, that says...?
|a='''A22''': There are many peer-reviewed papers published every month in scientific journals such as ],<ref>http://www.agu.org/journals/gl/ Geophysical Research Letters</ref> the ]<ref>http://ams.allenpress.com/perlserv/?request=get-moreinfo&issn=1520-0442 Journal of Climate}</ref> and others. We can't include all of them, so we wait to see if papers have significant impact. Misplaced Pages's ] states ''The scholarly acceptance of a source can be verified by confirming that the source has entered mainstream academic discourse, for example by checking the number of scholarly citations it has received in citation indexes.'' Brand-new papers will have accumulated few if any such citations, so we don't ordinarily base our writing on very recent works. |a='''A22''': There are many peer-reviewed papers published every month in scientific journals such as ],<ref>http://www.agu.org/journals/gl/ Geophysical Research Letters</ref> the ]<ref>http://ams.allenpress.com/perlserv/?request=get-moreinfo&issn=1520-0442 Journal of Climate}</ref> and others. We can't include all of them, so we wait to see if papers have significant impact. Misplaced Pages's ] states ''The scholarly acceptance of a source can be verified by confirming that the source has entered mainstream academic discourse, for example by checking the number of scholarly citations it has received in citation indexes.'' Brand-new papers will have accumulated few if any such citations, so we don't ordinarily base our writing on very recent works.

This FAQ item is currently under dispute .
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Revision as of 02:35, 6 January 2010

Below are answers to frequently asked questions about the corresponding page Climate change. They address concerns, questions, and misconceptions which have repeatedly arisen on the talk page. Please update this material when needed.

To view an explanation to the answer, click the link to the right of the question.

Q1: Is there really a scientific consensus on global warming? A1: 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. See also: Scientific opinion on climate change and Climate change consensus Q2: How can you say there's a consensus when someone has compiled a long list of skeptical scientists? A2: Over the years, a number of lists of so-called "skeptical scientists" have been produced. Notable among these are the Oregon Petition (circa 1999-2001, and re-circulated in 2007) and James Inhofe's list (originally released in 2007, re-released in 2008 with additional names added). These petitions have proven to be riddled with flaws To wit:
  • Many of the people listed aren't really scientists. For example, the definition of a "scientist" used in the Oregon Petition includes anyone who has a bachelor's degree – or anyone who claims to have a bachelor's degree, since there's no independent verification. Using this definition, approximately 25% of the US population is qualified to sign.
  • Some of the people listed aren't even people. Included on these lists are fictitious characters ("Dr. Perry Mason"), hoaxes ("Dr. Geri Halliwell"), and companies.
  • Of those who have a scientific background most work in fields unrelated to climate, such as the chemistry of coal ashes or the interactions between quarks and gluons.
  • Those who actually are scientists are listed arbitrarily, and many aren't skeptical of global warming. The Inhofe list was compiled by Inhofe staffer Marc Morano with no effort to contact the people listed. One climatologist, George Waldenberger, even informed Inhofe's staff that he is not skeptical of the consensus on global warming. His request to have his name removed from the list was ignored. Similarly, Steve Rainer of Oxford University has asked for his name to be removed and calls his inclusion "quite outrageous". The Heartland Institute has stated that scientists who have told the Institute that it misrepresented their views on global warming "have no right – legally or ethically – to demand that their names be removed" from the Institute's list.
Q3: Did global warming end in 1998? A3: One of the strongest El Niño events in the instrumental record occurred during late 1997 through 1998, causing a spike in global temperature. Choosing this abnormally warm year as the starting point for comparisons with later years produces a cooling trend; choosing any other year in the 20th century produces a warming trend. Keep in mind that 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. Another important point is that 10 years isn't long enough to detect a climate trend. The World Meteorological Organisation specifies 30 years as the standard averaging period for climate statistics so that year-to-year fluctuations are averaged out. Q4: How can we say global warming is real when it's been so cold in such-and-such a place? A4: It's called "global warming", not "(region X) 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)." Q5: Can't the increase of CO2 be from natural sources, like volcanoes or the oceans? A5: While these claims are popular among global warming skeptics, even some academically trained ones, 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. 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. (In fact the rate of CO2 increase was noticeably lower for a year or two after the Pinatubo eruption. This is thought to be related to the scattering of sunlight by volcanic dust and aerosols, which made plants absorb CO2 more efficiently.)
  • Isotopic analysis of atmospheric carbon dioxide shows that the observed change in the ratio of carbon isotopes reflects the isotopic ratios in fossil fuels.
  • Atmospheric oxygen content is decreasing at a rate that agrees with the amount of oxygen being used to burn fossil fuels.
  • If the oceans were giving up some of their carbon dioxide, we would expect their carbon dioxide concentration to decrease. But instead we are measuring an increase in the oceans' carbon dioxide concentration, resulting in the oceans becoming more acidic (or more accurately, less basic).
Q6: I think the article is missing some things, or has some things wrong. Can I change it? A6: If you have documented evidence from the peer-reviewed literature, or if you have other information that meets standards of verifiability, reliability, and no original research, consider adding it to the article. If you do not have such evidence, note that there are many forums which welcome general discussions of global warming, but the article talk page is not such a forum. Please limit your talk page comments to improving the article, not discussing the topic. Q7: Why haven't the graphs been updated? A7:
  • 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 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. Thus, in terms of climate change, any given year's data is of little import.
Q8: Isn't global warming "just a theory"? A8: That the temperature is rising is an observation (more specifically, the average of many observations). The explanation for this observation is a scientific theory. This is different from the common use of "theory" to mean a guess or supposition. A scientific theory is a coherent set of explanations that is compatible with the known observations, that allows predictions to be made, and that has a number of other properties (see the above linked article). A theory that makes verifiable predictions that turn out to be correct gains credibility. Strictly speaking, science does not prove anything. A theory is the best it can provide. Q9: Does methane cause more warming than CO2? A9: 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 (on the order of 100 years). So methane tracks current emissions, while CO2 accumulates in the atmosphere over long periods. For details see the greenhouse gas and global warming potential articles. See also: Clathrate gun hypothesis and Arctic methane release Q10: Wasn't Greenland much warmer during the period of Norse settlement? A10: Greenland was not significantly warmer during the period of Norse settlement. While much of Greenland was and remains under a large ice shelf, the areas of Greenland that were settled by the Norse were coastal areas with fjords that, to this day, remain quite green. Please 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 Brattahlid and Gardar farms were located
  • A zoom in on the general area of the Sandnes farm
  • Ruins:
    • Photos of the Gardar ruins:
    • The Brattahlid ruins
    • Hvalsey church:
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 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 a number of different 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. Claims that global sea ice has stayed the same or increased are a result of cherry picking two datapoints to compare, while ignoring the real (strongly statistically significant) downward trend in measurements of global sea ice. See also: Arctic shrinkage Q13: Weren't scientists telling us in the 1970s that we were 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. The common misperception that cooling was the main concern during the 1970s arose from a few studies that were sensationalized in the popular press. (Newsweek eventually apologized for having misrepresented the state of the science in the 1970s.) Q14: Doesn't water vapor cause 98% of the greenhouse effect? A14: Water vapour is indeed a major greenhouse gas, contributing about 36% to 70% 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. Rising temperatures caused by the long-lived greenhouse gases therefore will increase the absolute amount of water vapour in the atmosphere, amplifying the greenhouse effect. This is an example of a positive feedback. Thus, while water vapour does not act as driver of climate change, it does amplify existing trends. See also: Greenhouse gas and Greenhouse effect Q15: Was there a time when most scientists believed the earth was flat? A15: Knowledge about the approximately spherical shape of the Earth was widespread among educated people long before the advent of modern science. Eratosthenes already gave a very good estimate for the diameter in 240 BC. Christopher Columbus was not laughed out of court because he believed the Earth was round, but because he assumed an unrealistically small diameter to make Asia reachable. See Flat Earth, which, among other goodies, has a sourced statement that "since the eighth century, no cosmographer worthy of note has called into question the sphericity of the Earth." Q16: Is the fact that other solar system bodies are warming evidence for a common cause (i.e. the sun)? A16: 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. Abdussamatov's views have no support in the scientific community. Indeed, the second page of the National Geographic article makes this 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."
  • 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. 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.
  • 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. 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 our warmest summer temperatures occur a month or two after the longest day of the year). 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 Misplaced Pages's own article.
See also: Climate of Mars and Extraterrestrial atmosphere Q17: Do scientists support global warming just to get more money? A17:
  • Scientists participate in international organizations like the IPCC as part of their normal academic duties. They do not receive any extra compensation beyond possibly direct expenses.
  • Scientific grants do not usually award any money to a scientist personally, but only towards the cost of his or her scientific work.
  • In the U.S., global warming was seen as a politically sensitive topic under the Bush administration, which discouraged scientists from working on the topic.
  • It could also be argued that more money lies in examining the policy debate on global warming.
Q18: Doesn't the climate vary even without human activity? A18: Indeed, climate varies both with and without humans. But the fact that natural variations occur doesn't mean that human-induced changes can't also occur and vice versa. Q19: Should we include the view that global warming will lead to planetary doom or catastrophe? A19: This page is about the science of global warming. It doesn't talk about planetary doom or catastrophe. Q20: Is an increase in global temperature of, say, 6 degrees Fahrenheit (3.3 degrees Celsius) important? A20: The nearest concept that is relevant is that there are ranges to which species and human society have adapted. Though it may not sound like much, a global temperature rise of 6 degrees Fahrenheit (3.3 degrees Celsius) is huge in climate terms. For example, the sea level rise it produced would flood coastal cities around the world.
  • Earth 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 exisiting land use. In short, the main problem is not the absolute temperature, but the massive and unprecedentedly fast change in climate, and the second order-effects to human societies. The IPCC AR4 WG2 report has a detailed discussion of the effects of rapid climate change.
Q21: Why are certain proposals discarded, deleted, or ignored? Who is Scibaby? A21: Scibaby is a long term abusive sock-master (or coordinated group of sock masters) who has created over 400 confirmed sock puppets, another 120+ suspected socks, and probably many untagged or unrecognized ones. Misplaced Pages:Sockpuppet investigations/Scibaby/Archive lists some recent creations. His modus operandi has changed over time, but includes proposing reasonably worded additions on talk that only on close examination turn out to be irrelevant, misinterpreted, or give undue weight to certain aspects, apparently with the aim of wasting time and/or appearing as the innocent victim of Misplaced Pages's alleged AGW cabal. Scibaby is banned, and Scibaby socks are blocked as soon as they are identified. Some editors silently revert his additions, per WP:DENY. Others ignore them, still others still assume good faith even for likely socks and engage them. Q22: What about this really interesting recent peer reviewed paper I read or read about, that says...? A22: There are many peer-reviewed papers published every month in scientific journals such as Geophysical Research Letters, the Journal of Climate and others. We can't include all of them, so we wait to see if papers have significant impact. Misplaced Pages's guideline on reliable sources states The scholarly acceptance of a source can be verified by confirming that the source has entered mainstream academic discourse, for example by checking the number of scholarly citations it has received in citation indexes. Brand-new papers will have accumulated few if any such citations, so we don't ordinarily base our writing on very recent works. This FAQ item is currently under dispute here.References
  1. Dissenter on Warming Expands His Campaign. New York Times, April 9, 2009.
  2. Retention of sulphur by laboratory-prepared ash from low-rank coal
  3. Today: George WaldenbergerGrist.org. December 3. 2007
  4. Kaufman, Leslie (April 9, 2009). "Dissenter on Warming Expands His Campaign". The New York Times. Retrieved 2009-07-09.
  5. World Meteorological Organisation: Climate FAQs
  6. World Meteorological Organisation: Climate FAQs
  7. Tom Harris. "Scientists who work in the fields liberal arts graduate Al Gore wanders through contradict his theories about man-induced climate change". National Post. Retrieved 11 January 2009.
  8. Paul Joseph Watson (09 March 2007). "Powerful Documentary Trounces Man-Made Warming Hoax". PrisonPlanet.com. Retrieved 11 January 2009. {{cite web}}: Check date values in: |date= (help)
  9. Benj Arriola. "5 Good Arguments Why GlobalWarming is NOT due to Man-made Carbon Dioxide". Global Warming Awareness Blog. Retrieved 11 January 2009.
  10. Dr Jarl Ahlbeck. "Increase of the Atmospheric Carbon Dioxide Concentration due to Ocean Warming". Retrieved 11 January 2009.
  11. Simon Kirby (11 April 2007). "Top scientist debunks global warming". The Herald Sun. Retrieved 11 January 2009.
  12. Catherine Brahic (16 May 2007). "Climate myths: Human CO2 emissions are too tiny to matter". New Scientist. Retrieved 11 January 2009.
  13. Gu,L., D.D. Baldocchi, S.C. Wofsy, J.W. Munger, J.J. Michalsky, S.P. Urbanski and T.A. Boden (2003). "Response of a Deciduous Forest to the Mount Pinatubo Eruption: Enhanced Photosynthesis". Science. 299 (5615): 2035–2038.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  14. "More Notes on Global Warming". Physics Today. May 2005. Retrieved 2007-09-10.
  15. M. Battle, M. L. Bender, P. P. Tans, J. W. C. White, J. T. Ellis, T. Conway, and R. J. Francey (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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  16. The Royal Society (2005). "Ocean acidification due to increasing atmospheric carbon dioxide". Retrieved 11 January 2009.
  17. "Met Office:Climate averages". BBC. Retrieved 23 January 2009.
  18. "Cold Hard Facts". Tamino. 08 January 2009. Retrieved 21 January 2009. {{cite web}}: Check date values in: |date= (help)
  19. Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1175/2008BAMS2370.1, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1175/2008BAMS2370.1 instead.
  20. Kate Ravilious (February 28, 2007). "Mars Melt Hints at Solar, Not Human, Cause for Warming, Scientist Says". National Geographic News. Retrieved 2008-03-06.
  21. Kate Ravilious (February 28, 2007). "Mars Melt Hints at Solar, Not Human, Cause for Warming, Scientist Says (page 2)". National Geographic News. Retrieved 2008-03-06.
  22. Philip, Marcus S. (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 2007-05-09. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  23. Goudarzi, Sara (2006-05-04). "New Storm on Jupiter Hints at Climate Change". Space.com. Retrieved 2007-05-09. {{cite web}}: Check date values in: |date= (help)
  24. Philip, Marcus S. (2004-04-22). "Prediction of a global climate change on Jupiter" (PDF). Nature. 428 (6985): 828–831. Retrieved 2007-05-09. {{cite journal}}: Check date values in: |date= (help)
  25. Yang, Sarah (2004-04-21). "Researcher predicts global climate change on Jupiter as giant planet's spots disappear". University of California, Berkeley. Retrieved 2007-05-09. {{cite web}}: Check date values in: |date= (help)
  26. J. L. Elliot, A. Ates, B. A. Babcock, A. S. Bosh, M. W. Buie, K. B. Clancy, E. W. Dunham, S. S. Eikenberry, D. T. Hall, S. D. Kern, S. K. Leggett, S. E. Levine, D.-S. Moon, C. B. Olkin, D. J. Osip, J. M. Pasachoff, B. E. Penprase, M. J. Person, S. Qu, J. T. Rayner, L. C. Roberts, Jr, C. V. Salyk, S. P. Souza, R. C. Stone, B. W. Taylor, D. J. Tholen, J. E. Thomas-Osip, D. R. Ticehurst and L. H. Wasserman (10 July 2003). "The recent expansion of Pluto's atmosphere". Nature (424): 165–168. doi:doi:10.1038/nature01762. {{cite journal}}: Check |doi= value (help)CS1 maint: multiple names: authors list (link)
  27. Paul Harris (21 September 2003). "Bush covers up climate research". The Guardian. Retrieved 11 January 2009.
  28. Juliet Eilperin (05 February 2007). "AEI Critiques of Warming Questioned". Washington Post. Retrieved 11 January 2009. {{cite web}}: Check date values in: |date= (help)
  29. "Bribes offered to scientists". The Sydney Morning Herald. 03 February 2007. Retrieved 11 January 2009. {{cite web}}: Check date values in: |date= (help)
  30. "The Working Group II contribution to the IPCC Fourth Assessment Report". 2007. Retrieved 2007-10-22.
  31. http://www.agu.org/journals/gl/ Geophysical Research Letters
  32. http://ams.allenpress.com/perlserv/?request=get-moreinfo&issn=1520-0442 Journal of Climate}
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