Anthony Watts has been on a tear recently of excellent posts concerning global warming over at his blog "Watts Up With That?". The above graph created by Anthony Watts shows global temperatures since 1978. Do you see a warming trend? You might notice that the current temperature is within less than one tenth of a degree of where it was in 1978. In a period of rapid global industrial expansion and sky rocketing carbon emissions - world temperatures during that period peaked in 1998, that's a decade ago for you non-math majors. As Brett Stevens recently wrote in the Wall Street Journal in regard to the absence of evidence for global warming:
NASA now begrudgingly confirms that the hottest year on record in the continental 48 was not 1998, as previously believed, but 1934, and that six of the 10 hottest years since 1880 antedate 1954. Data from 3,000 scientific robots in the world's oceans show there has been slight cooling in the past five years, never mind that "80% to 90% of global warming involves heating up ocean waters," according to a report by NPR's Richard Harris.
The Arctic ice cap may be thinning, but the extent of Antarctic sea ice has been expanding for years. At least as of February, last winter was the Northern Hemisphere's coldest in decades.