Editing Greenhouse effect (section)

===Venus===
The greenhouse effect on [[Venus]] is particularly large, and it brings the surface temperature to as high as {{convert|735|K|C F|abbr=on}}. This is due to its very dense atmosphere which consists of about 97% carbon dioxide.<ref name="McKay1991"/>

Although Venus is about 30% closer to the Sun, it absorbs (and is warmed by) ''less sunlight'' than Earth, because Venus reflects 77% of incident sunlight while Earth reflects around 30%. In the absence of a greenhouse effect, the surface of Venus would be expected to have a temperature of {{Convert|232|K}}. Thus, contrary to what one might think, being nearer to the Sun is not a reason why Venus is warmer than Earth.<ref name="uwatmos211oct10">{{cite web |date=10 October 2001 |title=ATM S - Climate and Climate Change |url=https://atmos.washington.edu/academics/classes/2001Q4/211/notes_greenhouse.html |access-date=14 June 2023 |publisher=University of Washington}}</ref><ref>{{cite web |title=Venus Fact Sheet |url=https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html |access-date=25 April 2023 |website=NASA Space Science Data Coordinated Archive }}</ref><ref>{{cite web |title=5 Weird Facts About Venus |url=https://www.britannica.com/list/5-weird-facts-about-venus#:~:text=Even%20though%20Venus%20is%20much,and%20reradiated%20as%20infrared%20radiation. |access-date=25 April 2023 |publisher=Britannica}}</ref>

Due to its high pressure, the CO<sub>2</sub> in the atmosphere of Venus exhibits ''continuum absorption'' (absorption over a broad range of wavelengths) and is not limited to absorption within the bands relevant to its absorption on Earth.<ref name="Pierrehumbert2011" />

A [[runaway greenhouse effect]] involving carbon dioxide and water vapor has for many years been hypothesized to have occurred on [[Venus]];<ref>{{cite journal |last1=Rasool |first1=I. |last2=De Bergh |first2=C. |date=June 1970 |title=The Runaway Greenhouse and the Accumulation of CO<sub>2</sub> in the Venus Atmosphere |url=http://pubs.giss.nasa.gov/docs/1970/1970_Rasool_DeBergh.pdf |url-status=dead |journal=Nature |volume=226 |issue=5250 |pages=1037–9 |bibcode=1970Natur.226.1037R |doi=10.1038/2261037a0 |pmid=16057644 |s2cid=4201521 |archive-url=https://web.archive.org/web/20111021110413/http://pubs.giss.nasa.gov/docs/1970/1970_Rasool_DeBergh.pdf |archive-date=21 October 2011}}</ref> this idea is still largely accepted.<ref name="McCarthy">{{Cite web |last=McCarthy |first=Michael Cabbage and Leslie |title=NASA climate modeling suggests Venus may have been habitable |url=https://climate.nasa.gov/news/2475/nasa-climate-modeling-suggests-venus-may-have-been-habitable |url-status=live |archive-url=https://web.archive.org/web/20210811030814/https://climate.nasa.gov/news/2475/nasa-climate-modeling-suggests-venus-may-have-been-habitable/ |archive-date=11 August 2021 |access-date=11 August 2021 |website=Climate Change: Vital Signs of the Planet|date=10 August 2016 }}</ref> The planet [[Venus (planet)|Venus]] experienced a runaway greenhouse effect, resulting in an atmosphere which is 96% [[carbon dioxide]], and a surface [[atmospheric pressure]] roughly the same as found {{convert|900|m|ft|abbr=on}} underwater on Earth. Venus may have had water oceans, but they would have boiled off as the mean surface temperature rose to the current {{convert|735|K|C F|abbr=on}}.<ref>{{cite journal |author=Hashimoto, G. L. |author2=Roos-Serote, M. |author3=Sugita, S. |author4=Gilmore, M. S. |author5=Kamp, L. W. |author6=Carlson, R. W. |author7=Baines, K. H. |date=2008 |title=Felsic highland crust on Venus suggested by Galileo Near-Infrared Mapping Spectrometer data |journal=[[Journal of Geophysical Research: Planets]] |volume=113 |issue=E9 |pages=E00B24 |bibcode=2008JGRE..113.0B24H |doi=10.1029/2008JE003134 |s2cid=45474562 |doi-access=free}}</ref><ref>{{cite web |author=David Shiga |date=10 October 2007 |title=Did Venus's ancient oceans incubate life? |url=https://www.newscientist.com/article/dn12769-did-venuss-ancient-oceans-incubate-life.html |url-status=live |archive-url=https://web.archive.org/web/20090324134332/https://www.newscientist.com/article/dn12769-did-venuss-ancient-oceans-incubate-life.html |archive-date=24 March 2009 |access-date=17 July 2019 |work=New Scientist}}</ref><ref name="Jakosky">{{cite book |last1=Jakosky |first1=Bruce M. |title=The New Solar System |date=1999 |publisher=Sky Publishing |isbn=978-0-933346-86-4 |editor1-last=Beatty |editor1-first=J. Kelly |edition=4th |location=Boston |pages=175–200 |chapter=Atmospheres of the Terrestrial Planets |oclc=39464951 |editor2-last=Petersen |editor2-first=Carolyn Collins |editor3-last=Chaikin |editor3-first=Andrew}}</ref>