The Energy Challenge | Exotic Visions  By WILLIAM J. BROAD Published: June 27, 2006 http://www.nytimes.com/2006/06/27/science/earth/27cool.html?_r=1&oref=slogin

In the past few decades, a handful of scientists have come up with big, futuristic ways to fight global warming: Build sunshades in orbit to cool the planet.