Editing IPCC:AR6/WGI/Chapter-1 (section)

=== Attribution of changes in atmospheric greenhouse gas concentrations to anthropogenic activity ===

The AR6 WGI [[IPCC:Wg1:Chapter:Chapter-5|Chapter 5]] presents multiple lines of evidence that unequivocally establish the dominant role of human activities in the growth of atmospheric CO <sub>2</sub> , including through analysing changes in atmospheric carbon isotope ratios and the atmospheric O <sub>2</sub> –N <sub>2</sub> ratio (WGI Section 5.2.1.1). Decomposition approaches can be used to attribute emissions underlying those changes to various drivers such as population, energy efficiency, consumption or carbon intensity ( [[#Hoekstra--2003|Hoekstra and van den Bergh, 2003]] ; [[#Raupach--2007|Raupach et al., 2007]] ; [[#Rosa--2012|Rosa and Dietz, 2012]] ). Combined with attribution of their climate outcomes, the attribution of the sources of GHG emissions can inform the attribution of anthropogenic climate change to specific countries or actors ( [[#Matthews--2016|Matthews, 2016]] ; [[#Otto--2017|Otto et al., 2017]] ; [[#Skeie--2017|Skeie et al., 2017]] ; [[#Nauels--2019|Nauels et al., 2019]] ), and in turn inform discussions on fairness and burden sharing (WGIII Chapter 14).

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