Redigerer Global oppvarming (avsnitt)

=== Vitenskapelig diskusjon ===
Det pågår en diskusjon gjennom publisering av fagfellevurderte vitenskapelige artikler som vurderes av forskere som arbeider i de aktuelle feltene som deltar i [[FNs klimapanel]]. Den vitenskapelige enighet fra og med 2013 er angitt i [[IPCCs femte hovedrapport]], som fastslår at «det er svært sannsynlig at menneskelig påvirkning har vært den dominerende årsak til den observerte oppvarmingen siden midten av 1900-tallet».<ref name="ipcc">{{Kilde www | forfatter= IPCC | tittel = Detection and Attribution of Climate Change / Summary for Policymakers | url = http://www.ipcc.ch/report/ar5/wg1/ | sitat = «It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century» (page 15) and «In this Summary for Policymakers, the following terms have been used to indicate the assessed likelihood of an outcome or a result: (...) extremely likely: 95–100%» (page 2).
 }}, in {{Harvnb|IPCC AR5 WG1|2013}}.</ref> En rapport fra 2008 fra det amerikanske [[National Academy of Sciences]] sier at de fleste forskere da var enige om at den observerte oppvarmingen de siste tiårene skyldes hovedsakelig menneskelige aktiviteter som øker mengden av [[klimagass]]er i atmosfæren.<ref name=nrc2008>{{cite web| year = 2008| title = Understanding and Responding to Climate Change| publisher = Board on Atmospheric Sciences and Climate, US National Academy of Sciences| author = NRC| page = 2| url = http://dels.nas.edu/resources/static-assets/materials-based-on-reports/booklets/climate_change_2008_final.pdf| accessdate = 9. november 2010| archive-date = 2019-09-06| archive-url = https://web.archive.org/web/20190906090311/http://dels.nas.edu/resources/static-assets/materials-based-on-reports/booklets/climate_change_2008_final.pdf| url-status = yes}}</ref> I 2005 uttalte [[Royal Society]] at mens det overveldende flertall av forskere var enige om hovedpunktene, var det noen individer og organisasjoner som motsatte seg konsensusen om nødvendigheten av hastetiltak for å redusere utslipp av klimagasser. Disse har forsøkt å undergrave vitenskapen og arbeidet til FNs klimapanel.<ref name="royal society misleading arguments">{{cite book |date=13. april 2005 | author=Royal Society
| contribution=Letter from The Royal Society: A GUIDE TO FACTS AND FICTIONS ABOUT CLIMATE CHANGE: Misleading arguments: Many scientists do not think that climate change is a problem. Some scientists have signed petitions stating that climate change is not a problem. ...   There are some individuals and organisations, some of which are funded by the US oil industry, that seek to undermine the science of climate change and the work of the IPCC. They appear motivated in their arguments by opposition to the United Nations Framework Convention on Climate Change and the Kyoto Protocol, which seek urgent action to tackle climate change through a reduction in greenhouse gas emissions.| title=Economic Affairs – Written Evidence| series=The Economics of Climate Change, the Second Report of the 2005–2006 session, produced by the UK Parliament House of Lords Economics Affairs Select Committee |url=http://www.publications.parliament.uk/pa/ld200506/ldselect/ldeconaf/12/12we24.htm
|publisher=UK Parliament website|accessdate=9. juli 2011}} This document is also available in [http://royalsociety.org/Facts-and-fictions-about-climate-change/ PDF format]</ref> I tillegg har nasjonale vitenskapsakademier oppfordret verdens politiske ledere til å kutte de globale utslippene.<ref>{{cite web| date = mai 2009| author = Academia Brasileira de Ciéncias (Brazil), Royal Society of Canada, Chinese Academy of Sciences, Académie des Sciences (France), Deutsche Akademie der Naturforscher Leopoldina (Germany), Indian National Science Academy, Accademia Nazionale dei Lincei (Italy), Science Council of Japan, Academia Mexicana de Ciencias, Russian Academy of Sciences, Academy of Science of South Africa, Royal Society (United Kingdom), National Academy of Sciences (United States of America)| title = G8+5 Academies’ joint statement: Climate change and the transformation of energy technologies for a low carbon future| url = http://www.nationalacademies.org/includes/G8+5energy-climate09.pdf| publisher = US National Academies website| accessdate = 5. mai 2010| archive-date = 2010-02-15| archive-url = https://web.archive.org/web/20100215171429/http://www.nationalacademies.org/includes/G8+5energy-climate09.pdf| url-status = yes}}</ref>

I den vitenskapelige litteraturen er det en sterk enighet om at den globale overflatetemperaturen har økt de siste tiårene, og at trenden hovedsakelig skyldes menneskeskapte utslipp av klimagasser.<ref>{{cite journal|author=John Cook et al|url=https://iopscience.iop.org/article/10.1088/1748-9326/11/4/048002/meta|title=Consensus on consensus: a synthesis of consensus estimates on human-caused global warming|accessdate=21. juli 2016|date=13. april 2016|journal=Environmental Research Letters|volume=11|issue=4|doi=10.1088/1748-9326/11/4/048002|pages=048002}}</ref> Ingen vitenskapelige organer av nasjonal eller internasjonal betydning har vært uenig i dette synet.<ref name="The MIT Press"/><ref name=AQAonAAPG>{{cite journal|author=Julie Brigham-Grette|title=Petroleum Geologists' Award to Novelist Crichton Is Inappropriate|journal=[[Eos (journal)|Eos]]|volume=87|issue=36|quote=The AAPG stands alone among scientific societies in its denial of human-induced effects on global warming.|url=http://onlinelibrary.wiley.com/doi/10.1029/2006EO360008/abstract|date=september 2006|accessdate=23. januar 2007|format=PDF|ref=harv|display-authors=etal|doi=10.1029/2006EO360008|bibcode=2006EOSTr..87..364B|pages=364}}</ref>