Not sure how this fits into any of the conspiracy theories, but it turns out the Saudis have an interesting view of climate change and greenhouse gas emissions reduction:

http://www.nytimes.com/2009/10/14/bu....html?_r=1&hpw
Saudi Arabia is trying to enlist other oil-producing countries to support a provocative idea: if wealthy countries reduce their oil consumption to combat global warming, they should pay compensation to oil producers.

The oil-rich kingdom has pushed this position for years in earlier climate-treaty negotiations. While it has not succeeded, its efforts have sometimes delayed or disrupted discussions. The kingdom is once again gearing up to take a hard line on the issue at international negotiations scheduled for Copenhagen in December.
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If it pisses off the Saudis, and means we send them less money while causing fewer emissions of all the other crap in vehicle exhaust, I say trying to get off of fossil fuels is a winner no matter how accurate the current science turns out to be. If we can slow the pace of climate change, great; if not, we (and this is a big "we", not just the US) still reduce our dependence on our enemies, a bunch of late-medievalists who happen to be some of Al Qaeda and the Taliban's biggest supporters.