IN GREENLAND, an upside to global warming. “But now that the climate is warming, it is not just old trees that are growing. A Greenlandic supermarket is stocking locally grown cauliflower, broccoli and cabbage this year for the first time. Eight sheep farmers are growing potatoes commercially. Five more are experimenting with vegetables. And Kenneth Hoeg, the region’s chief agriculture adviser, says he does not see why southern Greenland cannot eventually be full of vegetable farms and viable forests. . . . Cod, which prefer warmer waters, have started appearing off the coast again. Ewes are having fatter lambs, and more of them every season. The growing season, such as it is, now lasts roughly from mid-May through mid-September, about three weeks longer than a decade ago.” During the Holocene climatic optimum, hardwood forests grew to the edge of the Arctic ocean, and Norwegian women wore string miniskirts. Downside: The American midwest was near-desert. That probably outweighs Norwegian women in string miniskirts, however appealing that may be.