I mean that change is not an aberration, it's the way the world works. A thousand years ago, the Northern Hemisphere was in the middle of the Medieval Warm Period. Temperatures then were high enough that the Vikings could cultivate Greenland, which today is covered with ice. By 1500, the climate pendulum had swung the other way. The next few centuries were so cold that historians call them the Little Ice Age. Oranges stopped growing in China. Glaciers engulfed French villages. Then in the 20th century, the world started warming up again. Climate changes. It always has.
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Straight from Mount Sinai: the Intergovernmental Panel on Climate Change. That's the United Nations panel whose reports are driving most public policy on this issue. And what the IPCC says about global warming and wild weather is pretty much the case for every other sweeping claim uttered about global warming: The evidence just isn't there.

"Keeping cool on global warming ", Jeff Jacoby, Boston Globe, 2001.12.16