Amusing column in the Washington Post today. (And I mean “amusing” in a bitterly ironic sort of way).
The US has spent roughly $300 billion on the Iraq war, with the final figure estimated to be in the ballpark of $500 billion to $1 trillion. Implementing the Kyoto Protocol, on the other hand, is estimated to cost the US somewhere in the neighborhood of $300 – $350 billion (though those figures are speculative and, some would argue, inflated.)
By the way, the Kyoto Protocol was rejected by US lawmakers because it would harm the economy too much.