I would agree with your long term prognosis of what needs to be done.

When I first started noticing the debate, the IPCC I think settled on the 550 level.  It was something of a political compromise.

Now the leading climate scientists are talking 450, but some are talking lower.

Positive feedback loops are not something that politicians understand, nor most laymen.

http://web.mit.edu/jsterman/www/cloudy_skies1.pdf

I can't pluck the abstract out of the pdf, but it's really all you need to know.  A relative rate problem with a bathtub, a running tap and a drain-- and most graduate students still get it wrong.

I was laughing to myself... they tested this model on 'MBA students at Harvard'.

I guess President Bush (HBS class of 1973) wasn't in the test group?

;-).