The big damages come if the climate sensitivity to greenhouse gases turns out to be high [causing greater global warming than current projections.] Then its not a bullet headed at us, but a thermonuclear warhead.
In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) -- Carl Sagan
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