Seen from space, the Blue Planet is looking whiter in a few more places. There’s a reason those pictureperfect, whitewashed towns in Greece and Spain look the way they do. People in the Mediterranean realised long ago white roofs were cooler than dark ones. What is new is the realisation white roofs could help cool the entire planet. In the U.S, white roof projects gained attention from Barack Obama’s energy secretary, the Nobel Prize-winning physicist Steven Chu, who said power bill savings of 10 or 15 per cent were possible in buildings with white roofs. Chu decided all roofs on Energy Department buildings had to be either white or reflective. The White Roof Project of New York told CNN painting 80 per cent of city roofs in the tropical and temperate climate zones would offset the carbon emissions of 300m cars, or 500 coal power plants.