Dr. Roger Angel, an astronomer from the University of Arizona has come up with a theory that he thinks will stop, and perhaps even reverse global warming. His theory involves a massive sun shield.
The shield would cover about 100,000 square miles and be made up by trillions of mirrors that would be launched (fired) into space about one million miles above earth. The shield would form a "sun shade" that would deflect the sun's rays. The article does not say how much of the sun's rays would be deflected.
How would they get the mirrors launched that far out into space?
They would use a huge (and I mean huge!!) cannon, which would pack 100 times the power of conventional weapons. The barrel of this cannon would need to be over a half mile (.6 miles) in diameter! I can't imagine the amount of noise and ground shaking this thing would produce.
The cannon would need to be fired at least a million times.
If the project can get going in the near future, it could be ready to launch in 20 or 30 years. If successful, the mirrors could last 50 years before being replaced.
Angel says that the cost of the project would be about 350 trillion dollars!
So far, Dr. Angel has secured NASA funding for a pilot project.
Researchers at the University of Victoria, Canada are currently testing the sun shield theory by using computer simulations. You can watch more about the testing of this theory on the embedded video segment by DiscoveryChannel UK, which is next to the Telegraph article.