UA astronomer Roger Angel is scheduled to be on Ways to Save the Planet on the Discovery Channel at 7pm on Sunday (at least that's the British schedule) to describe his plan to launch trillions of mirrors [right, design of one of the glass mirrors] into space to create a 100,000 square mile sun shade to counter global warming.
If that sounds implausible, listen to some of the other details. The mirrors would be fired into space by a cannon with a barrel over 3,000 feet across. The cannon would be 100 times more powerful than conventional weapons. The mirrors would be in orbit a million miles above the Earth. Cost? Just $350 trillion.
Dr.Angel got preliminary funding to pursue the idea rom NASA's Institute for Advanced Concepts in 2006