New solar, wind and hydropower sources were added in 2015 at the fastest rate the world has yet seen, a study says. Investments in renewables during the year were more than double the amount spent on new coal and gas-fired power plants, the Renewables Global Status Report found. For the first time, emerging economies spent more than the rich on renewable power and fuels. Over 8 million people are now working in renewable energy worldwide. For a number of years, the global spend on renewables has been increasing and 2015 saw that arrive at a new peak according to the report.