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I think it is time to put up or shut up. We should have several nations propose legislation that they would collectively join together under a UN effort, to inject via spacecraft small reflective particles into the earth's upper atmosphere. Those particles would increase the amount of solar radiation that is reflected away from the earth's surface. That would cool the planet and hence counteract global warming and save us from destruction. Or if the global warming folks are wrong, it could bring about the next ice age and mass starvation on the planet.

But hey, it would resolve things. However, the tree-huggers would never go for a “man-made” solution that didn't involve suffering and giving up modern lifestyle. So they will oppose it. It would make for interesting teledrama to have Al Gore say we need to keep the earth from warming, but we can't do it “that way” we need to do it in a way that will make people suffer and change our economic system.