Bruce Bartlett's latest column discusses some of the documentary evidence that climate change has been going on for millennia, even back into the B.C. era. Here is just one example:
Plato’s student, Aristotle, who lived from 384 BC to 322 BC, also recorded evidence of global warming in his work, “Meteorologica.” He noted that in the time of the Trojan War, the land of Argos was marshy and unarable, while that of Mycenae was temperate and fertile. “But now the opposite is the case,” Aristotle wrote. “The land of Mycenae has become completely dry and barren, while the Argive land that was formerly barren, owing to the water has now become fruitful.” He observed the same phenomenon elsewhere covering large regions and nations.
The hysterical calls from Al Gore and others for us to "do something" about "global warming" aren't based on sound science. At best, they've taken particular notice of a meteorological phenomenon and because of their ideological bent against business, capitalism and the West in general, believe mankind is destroying their precious Gaia.
Even if "global warming" is actually occurring, it's not only pretentious to believe that we could be causing it, the theory of an anthropogenic cause is gravely undermined by the evidence that points to natural climate change over time.