If the whole world used lighter roofing material it would save the equivalent energy of "turning off the world for a year." That's what our Energy Secretary and Nobel laureate, Steven Chu asserted in a recent NY Times article. Hmmm, is that why the house in my neighborhood painted white their exterior brick work, then their siding, and continued up onto the composite shingles? Apparently there are modern materials to provide a more aesthetically pleasing equivalent to paint and Wal-Mart, a surprising frontrunner in adoption of green practices, has installed the white roofing on 75% of their outlets. I feel a teensy more forgiving towards my neighbors choice. Read the NY Times article.