Renewable technologies could supply 80% of the world’s energy needs by mid-century, says the Intergovernmental Panel on Climate Change (IPCC). In a report, it says that almost half of current investment in electricity generation is going into renewables. But growth will depend on having the right policies in place, it says.
See http://www.bbc.co.uk/news/science-environment-13337864#story_continues_2.