President Obama's energy adviser [Stephen Chu] has suggested all the world's roofs should be painted white as part of efforts to slow global warming.
Telegraph, 27 May 2009
By using white roofing materials, [architects] could earn a point for helping a city like Philly stay cooler and therefore lower air-conditioning demand and natural-resource consumption for electricity generation. But the fact that they would spend more on heating costs was not always factored into the equation.
Philly.com, 29 June 2015