Practice English Speaking&Listening with: Why Cool Roofs?

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SECRETARY OF ENERGY STEVEN CHU: The reason we wanted the Department of Energy to take

the lead in cool roofs is to demonstrate that this really saves money.

If you have a roof and its black, its absorbing energy from the sun and its getting

hot. And it increases air conditioning bills; it does a lot of things. If you have a white

or a reflective roof that scatters back the visible radiation, of course it reduces your

energy consumption, but one of the amazing things about it is it also reflects that energy

back into space. There is very little greenhouse gas effect for visible light. Itsthe

heat light is being trapped by the carbon dioxide and the water vapor and other gases.

And so it helps keep the Earth cool in that way, as well. Its not only your home thats

being cooled; the Earth is being kept cool.

The department is installing cool roofs whenever financially possible, which means whenever

theres a new roof, whenever theres a re-roof, lets do some analysis: By putting

a cool roof on there, are you going to save money over the lifetime of the roof? And if

you are, put in a cool roof.

Im utterly convinced in most of the cases you will actually save money. Dont re-roof

with a blacktop roof just because thats a roof youre used to. As we transition

to cleaner sources of energy, the cleanest source of energy is the energy you dont

use and you dont have to generate, but in a way that doesnt impact your lifestyle.

The Description of Why Cool Roofs?