Most american cities are filled with dark roofed buildings -- all of those dark roofs mean that as a nation we're using a lot more air conditioning than we need to. But there's something we can do about it.
Reflective white roofs are good for keeping a home cool in summer, but what happens in winter? A temperature-sensitive tile -- black when temperatures are cold and white when temps are warm -- could offer a solution.
The U.S. Department of Energy is encouraging the use of reflective paint and "cool roofs" to increase the energy efficiency of homes and commercial bu...
In today's audio report: China & the U.S., together again
The real question is not whether we should move toward cool roof technology: it's why we haven't done it sooner.
