2 of 8
BACKNEXT
Space-based Frisbee deflectors
Space-based Frisbee deflectors
This is perhaps the most far-out idea here.

How it works: Deflect the sun's rays with a cluster of translucent disks, each two feet in diameter, placed in orbit between the earth and the sun.

The number of disks needed for the job is staggering: Some 16 trillion, according to Roger Angle, a professor of astronomy and optical sciences at the University of Arizona.

Why it might not work: The limiting factor here is how to launch these things into space, as it would be far too costly to send 16 trillion disks up by rocket.

So Angle is proposing a yet-to-be-built magnetic gun with a mile-long barrel to shoot the disks into space. Even then, he said it would still cost trillions of dollars.

"This is obviously pretty futuristic," he said. "But if we get to the panic point, you need to know a little bit about what your options are."

NEXT: A permanent haze

Last updated December 02 2009: 10:52 AM ET
Email | Print | Share  |  RSS
 
google my aol my msn my yahoo! netvibes
Paste this link into your favorite RSS desktop reader
See all CNNMoney.com RSS FEEDS (close)
More Galleries
Don't give my job to Staples Hundreds of U.S. Postal Service workers protested against experimental mini post offices at Staples. Here's why some Washington, D.C. workers don't like the deal. More
Tools to make your money grow You've started saving and built a financial base. Time for a few new strategies and tools to get your money to grow even more. From real estate to IRAs, here are some tips. More
Ready to start saving? Here's how to do it right When you are just starting out or finally starting to get serious about saving, the basics will get you far. Here are more than a dozen tips that will help you lay the base for building your net worth. More

Special Offer
Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.