So, Reuters took a look at the EPA’s economic analysis of the Lieberman-McCain Climate Stewardship Act (so I didn’t have to!). In case your memory is hazy, the CSA is a cap-and-trade bill that would cut emissions 65% by 2050. Here’s the nut:

The EPA found that the Climate Stewardship and Innovation Act of 2007 would shave up to 1.6 percent, or $419 billion, off a baseline forecast for U.S. gross domestic product in 2030 and up to 3.2 percent, or $1.332 trillion, by 2050.

Grist State of Emergency | A limited-run newsletter from Grist, exploring the ways climate disasters are reshaping elections. Delivered every Tuesday until Election Day.

Reader support helps sustain our work. Donate today to keep our climate news free.

That is, by any reasonable measure, a modest price to pay. Even so, I bet it overestimates the cost.

I’ll offer this open wager to anyone willing to take it. I’ll bet $1,000 (which is rich for me, believe me) that if a cap-and-trade similar to or stronger than the CSA is implemented by 2012, the net effect on GDP will be a positive in 2030 .

Takers?