On the side that states global warming is real, we have the scientists. Earth science, under which climate science is a sub-set, is funded by NASA and the NSF. Their budgets in 2010 were approximately
On the side with an interest in denying global warming, I will consider money in the energy sector.
- The energy sector contributed $354 billion to the economy in 2010 (NIPA table 1.5.5). About 85% of the energy the U.S. uses is from fossil fuels, so fossil fuel industries probably contribute about $300 billion to the U.S. GDP.
- Renewable energy makes up 8% of US energy, so it might bring in $27 billion per year.
- 3 of the top 5 Fortune 500 companies deal in fossil fuels. The combined revenue of those 3 companies, Exxon, Chevron, and Conoco, in 2010 was $736 Billion. Their profit was $60.9B.
- The Energy Information Service reports financial data from 30 major energy companies, which together account for about 43% of oil and natural gas production, and 78% of U.S. refining capacity. "In 2009, operating revenues of [these] companies totaled $1.3 trillion, which is equal to 13 percent of the $9.8 trillion in revenues of the Fortune 500 corporations."
Assume for a moment that money really drives the global warming debate. How much more incentive do those with vested interests in fossil fuels have in distorting the truth? For those looking to cash in on telling lies about scientific facts, how much more likely are they take the side of the fossil fuel industry? Considering profits in the U.S., the fossil fuel industry has 25 times more incentive to lie. Considering revenue, which is probably the proper metric for comparing against total science funding (scientists only pocket a some of the money spent on science) the anti-global warming crowd has 430 times more incentive to lie.
That's my effort to "follow the money." I'm sure there are other numbers one can use, so if anyone has better ones, I'd love to hear about them. However, I seriously doubt that any conclusion will be drawn aside from the obvious one: fossil fuels are far more lucrative than global warming science. It is the anti-global warming crowd that has the most financial incentive to lie.