Turn Down Heat: Why a 4°C Warmer World Must be Avoided

by Hans Joachim Schellnhuber, William Hare, Olivia Serdeczny et al.
A Report for the World Bank by the Potsdam Institute for Climate Impact Research and Climate Analytics, November 2012

106 pp. 14.9 MB(!):
http://www-wds.worldbank.org/external/default/WDSContentServer/WDSP/IB/2012/12/20/000356161_20121220072749/Rendered/PDF/NonAsciiFileName0.pdf

This report provides a snapshot of recent scientific literature and new analyses of likely impacts and risks that would be associated with a 4° Celsius warming within this century. It is a rigorous attempt to outline a range of risks, focusing on developing countries and especially the poor. A 4°C world would be one of unprecedented heat waves, severe drought, and major floods in many regions, with serious impacts on ecosystems and associated services. But with action, a 4°C world can be avoided and we can likely hold warming below 2°C.

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