First IPCC report on renewables concludes they can power the world.

80% of energy can come from renewable energy by 2050, the UN body concludes, provided governments maintain support. They could keep GHG concentrations below 450 ppm, and this would cost only some 1% of GNP per year. The IPCC’s 1,000 page Special Report on Renewable Energy Sources and Climate Change Mitigation (SRREN) is the UN’s first look in detail at low carbon energy. Of 300 GW new electricity capacity globally in the years 2008 & 2009, 140 was RE.