I agree with LAM in that the effects of global warming will be gradual. But, methinks we will see
1. The spread of tropical diseases northward into what were once temperate climatic zones.
2. The severe reduction if not disappearance of polar ice caps and the extinction of many artic species of flora and fauna.
3. Real estate prices on Greenland will skyrocket. It will once again become "green" and extensively habitable.
4. Same goes for Siberia and the Northwest Territories in Canada.
5. The construction of extensive dike systems to protect coastal cities such as those in use in New Orleans.
6. Global wet t-shirt contests in real time in an effort to stay cool.
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As far as the Yellowstone Caldera goes...
1. A run on "I survived the Yellowstone Caldera Extinction Event" t-shirts.
2. Congress will need to appropriate additional money for road repair in Yellowstone National Park, with a few extra dollars to replace the states of Wyoming, Montana and Idaho. They will also declare the Yellowstone Caldera the new National Land Fill.
3. The U.S. Border Patrol will be unable to stem the flood of Americans running into Mexico. President Fox of Mexico will declare Americans "illegal aliens" and die laughing as he complains to Bush.
4. Al Qadea will take credit for the blast.
(:raig