Solar energy revolution: Past point of no return

Since solar costs are beating those of competing energy sources, there are expectations of a boom in demand -- and it's going to be a global solar boom. GTM Research predicts that solar installations will triple to 135 GW annually by 2020...
http://www.usatoday.com/story/money/markets/2015/07/05/motley-fool-solar-energy/29583021/