Wow, I didn't realize so many climatologists played Civ...
Global Warming is a THEORY - not a fact. A fact is 2+2=4 and the capiltol of Norway is Oslo. Merely stating that it is a theory does not mean that someone believes or does not believe it might be true - however it is usually with breathless vitriol that most people who belive strongly in its correctness respond to anyone who has the slightest idea how science works and what the definition of a theory is, points out that global warming is still just a theory.
There is still quite a bit of debate regarding its validity and/or its severity - numerically more scientists believe it to be true, however there are a number of TOP scientists in each field (climatology, oceanography, meterology) that question the models being used to predict how it will progress in the future.
In that 1970's the worlds leading climatologists were almost in universal agreement that pollution particulates were plunging the world into a new ice age - global temperatures on average, were down and there was fear that much of the northern hemisphere would begin to form glaciers. Obviously, they were wrong.
I offer none of the above to convice you one way or the other that global warming in true or not true. I accept that certain aspects of it are likely factually true, while at the same time understanding that the models being used are still incomplete.
IMHO the most likely cause for carbon dioxide emission reduction will be the sprialing cost of fossil fuels - we've already approached the point where the payback time and cost per kW/hr for solar/wind/wave are approaching oil and natural gas. Only coal and nuclear are likely to remain fairly consistent in the near term. One is a greenhouse producer, the other is a distand dream for getting new plants built in the two or three countries that it really matters (US, China and India).