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Remember in 1973 the same science chatter said that the coming Ice Age is going to occur, we're going to lose millions of people. And the politicians knew how to solve it, they just didn't have the courage to solve it; they were going to put coal dust on the Arctic.

As a scientist, my attention became totally focused on global warming some 15 years ago by the elegant and powerful measurements of carbon dioxide trapped in ice cores taken as much as 2 miles deep from the great East Antarctica ice sheet.

Back in the '70s - I remember the '70s: we were told there was global cooling. And everyone was told global cooling was a really big problem. And then that faded.

If you compare Everest photographs in 1953 with its current state, things are melting. I imagine if I were a golfer in Indiana, I'd be hard-pressed to believe in climate change because nothing's going on there. But when you're up in the mountains and seeing the glaciers melt away, it's an obvious physical manifestation of a warming planet.

Several times in Earth's history, rapid global warming occurred, apparently spurred by amplifying feedbacks. In each case, more than half of plant and animal species became extinct. New species came into being over tens and hundreds of thousands of years. But these are time scales and generations that we cannot imagine.

As the 20th century unspooled, a cultural warming melted down many frozen class characteristics.

The earth's history over the past several million years is that for every 100,000 years, we go through a dramatic climatic cycle where we get 90,000 years of ice age and 10,000 years of a warm period. I think people today just have the expectation that we deserve a perfectly benign climate forever.

You want calamities? What about the Ice Age?