The report is the second chapter of the fifth assessment by the Intergovernmental Panel on Climate Change (IPCC), set up in 1988 to provide guidance for political action.
Activists believe that greenhouse gases - particularly carbon dioxide - that trap the heat from sunlight within the atmosphere are making the world warmer.
Deniers say temperature changes are natural and factors including solar activity are responsible and in any climate systems are too complex even for computer models to predict accurately.
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Fire and Brimstone
Climate change could drive turbulence and conflict, prompted by migration from newly uninhabitable areas and jockeying for water and food, the latest IPCC report said.
Warming of around two degrees Celsius over pre-industrial times may cost