Qui Gon's post reminded me of a pet theory of mine. (Much like opinions, everyone's got one.) The premise is the ultimate harm of global warming is that the "Oceanic Conveyor Belt" will stop due to glaciers and Greenland melting and lowering the salinity responsible for cold, salty water to fall to the bottom. This would stop or alter the Gulf Stream in a major way, setting up conditions for another Ice Age. Proposal- Using single hull tankers, which should be eliminated from crude oil service, salt mined in Russia could be sprayed around the North Sea. Sensors could be placed underwater to tell of the most advantageous locations. Lots of details and international cooperation to work out, but it sounds like a pro-active approach. Ultimately it woouldn't be a permanant solution, but could buy us time until alternative energy sources and new technology bring carbon emission levels under control. At the least, sensors, for determining just where and over how large an area the "drop zone" of the Conveyor Belt is, should be deployed. If nothing else, it would give us a baseline from which we could determine the extent of the problem.