Global ice cover acts as the planet's thermostat, regulating temperature by reflecting sunlight back into space. (illconsidered.blogspot.ru)
Such a structure could vastly improve the daylight cooling of buildings, cars and other structures by reflecting sunlight back into the chilly vacuum of space. (sciencedaily.com)
Any warming also leads to the rapid loss of snow cover and sea ice, both of which reflect sunlight back into space. (newscientist.com)