They say that we can keep global temperatures from rising 2C by cutting CO2 emissions by 25% to 80% (depending on which shaman you listen to) over 1990 levels by 2050. Do you really believe that this is even remotely possible given most of the world is over 1990 levels and the developing world is 2-3 times their 1990 levels.
How much do you think a barrel of oil will sell for next year? The higher the price of oil goes, the more competitive (and the more attractive) alternatives become.
Reductions in carbon emissions may be forced on the world economy.