"The insistence on complete certainty about the full details of global warming-the most serious threat we have ever faced-is actually an effort to avoid facing the awful, uncomfortable truth: that we must act boldly, decisively, comprehensively, and quickly, even before we know every last detail about the crisis. Those who continue to argue that the appropriate response is merely additional research are simply seeking to camouflage timidity or protect their vested interest in the status quo."

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Now it is worth noticing two things about the private substitutes that I have described. The first is that in the aggregate they are probably much more expensive than would be the implementation of the appropriate public policy. The second is that they are extremely poor replacements for the missing outcomes of good public policy. Nevertheless, it is plain that the members of a society can become so alienated from one another, so mistrustful of any form of collective action, that they prefer to go it alone.

— Brian Barry