Oct 19 Environment Green Roof, White Roof, Black Roof, Tiled Roof? Researchers at MIT have just announced that you can sort of have it all: they've developed roof tiles that change color depending on the temperature. Hot summer day? The tiles turn white. Cold, drizzly autumn day? Black, which absorbs as much as sun, they say, as the white reflects. By Kristin Espeland Oct 19 Environment Green Roof, White Roof, Black Roof, Tiled Roof? Kristin Espeland