The U.S. energy secretary supports the idea of painting rooftops and roads white to combat global warming.


Whitening the world’s roofs and roads would have the same effect on global warming as removing all the world’s cars for 11 years energy secretary Chu said.

A white roof has three benefits:

  • It keeps buildings cooler, reducing the amount of energy required for air conditioning.
  • It reduces the so-call “heat island” effect, the heating up of entire urban areas which then causes other buildings in the vicinity to heat up, whether they are in direct contact with the sun or not.
  • A white roof or road will actually reflect the sun’s rays back into space, keeping the atmosphere cooler.

White roofs would also reduce energy bills. So if your thinking about retrofitting you home consider a white or silver coloured roof or a white driveway.