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
World's Top Employers for New Grads For an exclusive CNNMoney list, research firm Universum Global surveyed college students around the world to see where they most want to work. More
A cheapskate's guide to tech From ebooks to phone service, here are some tips for living your digital life on the cheap. More
2015 Mustang's asphalt-peeling power goes modern The new Ford Mustang has been upgraded and updated to compete globally - but never fear, it's still a monster. 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 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.