I'm not always as convinced by game theory as most economists I've run across, but this guy lays out a cogent case for why acting on the very possibility of human-caused global warming is the only rational choice. In a nutshell, his argument is that - laying aside the question of global warming's verity - merely weighing the worst case scenarios of both action and inaction leaves concerted action as the safest of both "bets."
Personally, I understand why he's couching it this way, but his "action" column B looks even better when you factor in the fringe benefits of curbing global carbon emissions, regardless of any impact on global warming: lower pollution levels, a cleaner envronment, more efficient public transit, the remergence of walkable communities, shorter commutes, energy that is not dependent on an unstable supply (that, in an unrelated crisis, looks to be at the level of maximum production, and less than a decade away from actual contraction). Whereas even the best case "column A" inaction scenario leaves us with our current rates of pollution, suburban sprawl, dilapidated public transit, ever-lengthening commutes, and reliance on tenuous global oil reserves.
And then there's that other factor of global scientific consensus on the science of the matter in question. But even leaving that crushing climatological evidence aside, he makes a great argument.
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