Thanks for these articles, Mike. My impression is that there may be some truth in both. "Global" warming seems to be happening mainly in the Arctic, where the melting ice disrupts the flow of the Gulf Stream, as the first article discusses. An article in _The New Yorker_ a few years ago (sorry I don't have the reference) discussed the drilling in Greenland ice, which revealed 100,000-year cycles in the earth's climate; six of these were evident in ice cores. The earth is warm for 10,000 years; then the climate becomes dramatically unstable and plunges rapidly into an ice age for 90,000 years. We're right on the brink of another ice age. But I see no evidence that human action has anything to do with it.