Firstly, a link to a paper by Hansen:
http://www.bren.ucsb.edu/academics/courses/203/Readings/SlipperySlope%2017Jun04v21.pdf
I had a more up to date one, but the link's gone dead.
Hansen's alternative scenario has peak CO2 of 475 PPM in 2100 and
maximum warming not exceeding 1C.
Certainly on the CO2 front, this is entirely achievable with a start
in 2016 rather than 2006. As far as I can fathom his argument seems to
be that lag times in energy infrastructure will make it impossible to
achieve the required reductions starting in 2016, while they'd be
achievable starting in 2006.
If that is indeed what he is saying, I strongly disagree with it, and
it is also not a question where a climatologist would have any special
expertise.
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