Planetary Solar Shield
The latest plan for fighting global warming sounds more like intergalactic warfare: Launch clouds of miniature spacecraft that bend 1.8 percent of the sun´s light away from Earth. Roger Angel of Steward Observatory Mirror Laboratory in Arizona has worked out the math. Now, with financial backing from the NASA Institute for Advanced Concepts, he´s making a prototype of a light-diverting material. The gram-weight flyers he has in mind would be shot into L1 orbit, a sweet spot that follows the same yearly path as the Earth. From that vantage, the crafts´ collective shadow would help cool the entire planet.
WHY, GOD? WHY? Increasing carbon dioxide levels mean that global temperatures could rise by 10single page
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.