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^"Total radiative forcing is positive and has led to an uptake of energy by the climate system. The largest contribution to total radiative forcing is caused by the increase in the atmospheric concentration of CO2 since 1750." and "From 1750 to 2011, CO2 emissions from fossil fuel combustion and cement production have released 375 [345 to 405] GtC to the atmosphere, while deforestation and other land-use change are estimated to have released 180 [100 to 260] GtC." In: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Stocker, T.F., D. Qin, G.-K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex and P.M. Midgley (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.
^"Joint Science Academies' Statement"(PDF). 2005. 2013年9月9日時点のオリジナル(PDF)よりアーカイブ。2014年4月20日閲覧。It is likely that most of the warming in recent decades can be attributed to human activities (IPCC 2001). This warming has already led to changes in the Earth's climate.
^Mann, Michael E.; Toles, Tom (2016). The Madhouse Effect. New York Chichester, West Sussex: Columbia University Press. doi:10.7312/mann17786. ISBN978-0231541817。
^Oreskes, Naomi; Conway, Erik (2012). Merchants of doubt : how a handful of scientists obscured the truth on issues from tobacco smoke to global warming. Bloomsbury. ISBN978-1408824832. OCLC934374946。