Back in 1300 and 5000 BC there weren't 6.2 billion people to feed and keep alive either. There were more rainforests, trees, and natural areas. There weren't miles of concrete and billions of buildings.
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Originally Posted by Rodney
There's a somewhat easier, if also more dire and perhaps more uncontrollable solution: shoot a whole bunch of atomic sulphur up into orbit; let it spread out into a big cloud. Sulphur is white, and it reflects sunlight _really well._ If we could get enough sulphur up there, we could block a lot of the sun's energy. The question is, what happens if we put _too much_ up there? And how do you get rid of it when you don't want it anymore?
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Everything not in geosyncronus orbit will fall back down to Earth eventually. The only thing is, would it keep the heat generated from the Earth in? Rain clouds during the day keep it cooler, but rain clouds at night trap the heat.
And that would take a ton of trips with the space shuttle or some type of rocket to cover a large enough area to make a difference.