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what the science says 

Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia. The atmosphere and ocean have warmed, the amounts of snow and ice have diminished, sea level has risen, and the concentrations of greenhouse gases have increased.^




Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850 (see Figure SPM.1). In the Northern Hemisphere, 1983–2012 was likely the warmest 30-year period of the last 1400 years (medium confidence).^





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.^


Human influence on the climate system is clear. This is evident from the increasing greenhouse gas concentrations in the atmosphere, positive radiative forcing, observed warming, and understanding of the climate system.^




^ From the IPCC, 2013: Summary for Policymakers. 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.


*Please note this pages is a work in progress, and represents only portions of the IPCC assessment report. For more information, please download the PDF above.



more information


NASA Climate Change web site

Climate Central with the best amazing sea level rise mapping around founded by author, educator and environmentalist Bill McKibben

Pro Publica - Andy Revkin

Climate Science, Awareness and Solutions - James Hansen at the Earth Institute, Columbia University

Laumont-Doherty Earth Observatory's - Klaus Jacob at the Earth Institute, Columbia University



Oceans Melting Greenland (OMG) mission at NASA/JPL - studying the complex interaction between the ice sheets, sea ice, and land

Operation Ice Bridge (OIB) mission at Goddard - the largest airborne ice survery of the planet

NASA - GISS led by Gavin A. Schmidt



Bruno Latour

Timothy Morton



Extreme Ice Survey led by James Balog