For one thing, we're going to need to cool the planet somehow, probably by reflecting some sunlight back into space.

CNN: 'The Science Guy' says: 'Save the Earth'

You know, you're not going to cool the planet off.

NPR: Oceanographer Sees Real Effects of Climate Change

Runaway climate change could spur an island nation doomed to drown under rising seas or a wealthy entrepreneur with do-good intentions to deliberately inject sunlight-reflecting particles high into the stratosphere in a bid to cool the planet, the World Economic Forum warns.

MSN: The Maya may have sacrificed earliest domestic turkeys

One set of small-scale sunshine-reduction experiments discussed in Asilomar would send plumes of various sulphurous fluids in the stratosphere to find out which would best produce a haze of small particles similar to those that cool the planet after a large volcanic eruption.

ECONOMIST: Geoengineering

When computer models gave him the power to spin up winds on planets of the mind, his first big topic was a study of the net effects of smoggy pollutants in the atmosphere, which cool the planet down, and the carbon dioxide which warms it up.

ECONOMIST: Steve Schneider

Huge sheets of ice reflect solar radiation, keeping our planet cool.

CNN: Polar bears resort to cannibalism as Arctic ice shrinks

This is a process, and we will continue to test and try new things until we find a cup that keeps drinks hot, hands cool and is better for the planet.

CNN: N.Y. mayor seeks ban on plastic foam containers

You might be wondering how the planet could be warming if this past winter has been relatively cool.

CNN: CO2 levels hit new peak at key observatory

That has prompted some to speculate that the Earth may be entering another cool period that could offset the warming caused by greenhouse gases trapping heat in the planet's atmosphere.

ECONOMIST: The sun has gone quiet

Regardless of which theory is correct (and both might be wrong), the effect of fewer cosmic rays would be fewer clouds and since clouds tend to cool the earth by reflecting incoming solar radiation away from it a warmer planet.

ECONOMIST: Global warming: In flux | The

The "white parasol" at the top of the planet reflects energy from the Sun straight back out into space, helping to cool the Earth.

BBC: Major ice-shelf loss for Canada

And the nuclear-winter hypothesis (that the smoke from fires caused by a global nuclear war would blot out the sun's rays and thus cool the earth catastrophically) owes its origin, at least in part, to observations of a planet-wide dust storm on Mars.

ECONOMIST: Comparative meteorology