Global, human-induced climate change

Of course, the main problem with his argument is that we can choose column A, but we might already be too late, in which case we'll still get the horrible outcome of row2colB. But if we add column C, which is a contingency plan for when the earth turns to shit (such as building hydroponic food towers, elimination of all WMDs, cure for AIDS, increase to stem cell research funding) then we can get benefits either way while diminishing the negative outcomes of the worst case scenario.


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