• In the last few years, solar power has been growing at a rate fast enough to provide 10% of the world’s electricity by 2018 in large part due to the fact that solar powers have seen a continuing drop in price. 
• A past International Energy Agency prediction that by 2020 non-hydro sources of renewable would meet only 3% of the world’s energy needs was realized in 2008. 
• According to a report from the U.S. National Renewable Energy Laboratory, it is theoretically possible that over half of America’s energy will come from renewable sources by 2050.

From the article: “Right now, renewable energy sources like solar and wind still provide just a small fraction of the world’s electricity. But they’re growing fast. Very fast. Three new pieces of evidence suggest that many policymakers may be drastically underestimating just how quickly wind and solar are expanding. ...”