Yes. There've been lots of studies on that, but unfortunately, as an economist, I would say that the net effect is a cost in terms of economic output, as we traditionally measure it, from reducing greenhouse gases. The analysis that I have been working on recently, and I think there is some independent work going on for the National Round Table on the Environment and the Economy, suggests that the costs of reducing greenhouse gases over, let's say, a 40-year timeframe might cost you about a year or so of economic growth if you put the right policies in place immediately. So they're allowing you to transition gradually. Those are studies that do look at the benefits side as well and net all of that out.
