Did you know painting your home or office building roof a light color or installing white shingles helps to reflect heat, reducing cooling costs. Replacing a 1,000-square-foot dark roof with a white one can offset the emission of 11 tons of carbon dioxide annually. Roofs account for about 25 percent of the surface area in most cities, so there's a huge opportunity to reduce your eco-footprint just by changing the color of your roof! If white shingles aren’t your style, manufacturers also offer heat-reflective coatings in darker colors for shingles, tiles and metal roofs.