Patrick J. Michaels and Paul C. “Chip” Knappenberger have created a calculator of exactly how many degrees of global warming will be averted if the IPCC is right. I can’t think why the IPCC didn’t do this before.
For example, if all industrialized nations achieve a 100% reduction (that is, stop using coal, oil, gas, diesel, and avgas tomorrow*), then 87 years from now the world will be 0.352C cooler (assuming climate sensitivity is a high 4.5C and the models work, and nothing else changes in the atmosphere).
The great thing is you can adjust the parameters yourself to see how many ways Global Action does not add up.
Calculator from CATO.org (Click to go to the calculator)
Unfortunately it does not also project the costs. Version II perhaps?
*Please forgive me for that sweeping assumption. We all know that to get a true 100% reduction in CO2 emissions we’d need to do a lot more. Like building nuclear plants from handmade mud-bricks using solar powered trucks and wind-powered cranes. And no more flights to anywhere unless you have a pedal powered hang-glider or one of those marvelous solar planes that takes 2 months to cross the US.
Holidays in Hawaii would be for people who like to row (a lot).