The Global Cool Cities Alliance's white roof project made Doonesbury today!!
I think this organization is pretty spectacular, and my dad sits on the advisory board!
The concept is simple. Light colored surfaces reflect more sunlight than dark ones do, turning less of the sun’s energy into heat. Increasing the reflectance of our buildings and paved surfaces—whether through white surfaces or reflective colored surfaces—can reduce the temperature of buildings, cities, and even the entire planet.
A white roof in temperate or tropical regions absorbs about 70% less sunlight than an ordinary roof. Permanently replacing dark roofs and pavement around the world with highly reflective materials would have the same effect on the earth’s climate as avoiding over one year’s worth of global man-made CO2 emissions.
Steven Chu (Go Bears!), US Energy Secretary, on the topic: “Cool roofs are one of the quickest and lowest cost ways we can reduce our global carbon emissions and begin the hard work of slowing climate change”