I agree with bmgollhofer, but for a different reason. There's been NO measurable Global Warming since 1998, when it peaked and died. This is according to data from the AQUA satellite, made publicly available by the good folks at the University of Alabama, Huntsville. Since then, we've had some warmer-than-average years and some cooler-than-average years, but no real TREND.
The Warmist pseudoscientists who control the info from surface temperature stations and from some of the tree ring sets are extremely reluctant to disgorge their raw data. Instead, we get 'adjusted' numbers; this fact is not in dispute.
When Global Warming skeptics are successful in getting their hands on REAL data, they usually uncover cherry-picking (as in Keith Briffa's 'study' of larch tree rings in Nth Russia), transparent oopsies (like the claim that October 2008 was the warmest October on record), or outright fraud (like Michael Mann's infamous hockey stick graph).
As a nonspecialist (my academic background is in analytical chemistry), I've done an informal investigation in California's Nth Sierras on the claim of 'unprecedented' Global Warming. Constance Millar has done a much better study in the Southern Sierras. If anyone is interested, I'll post links to both investigations.
Taken as a whole, Catastrophic Anthropogenic Global Warming is the biggest scientific fraud since Lysenkoism in the old Soviet Union. And climate fraud is a multi-billion-dollar, taxpayer-funded industry.
Global warming? What bloody Global Warming? The legitimate concern is the next major advance of continental glaciers. On a geological time scale, we're nearly due for another one. And that's going to be extremely unfun.