But the United Nations climate panels latest assessment tells us precisely the opposite. For North America there is medium confidence that there has an overall slight tendency toward less dryness Moreover, there is no way that Krugman could have identified this drought as being caused by global warming without a time machine; Climate models estimate that such detection will be possible by 2048, at the earliest.
And, fortunately, this years drought appears unlikely to cause a food crisis, as global rice and wheat supplies retain plentiful. Moreover, Krugman overlooks inflation: Prices have increased six-fold since 1969. so, while com futures(期货) did set a record of about S8 per bushel(葡式耳)in late July, the inflation-adjusted price of corn was higher throughout most of the 1970s, reaching 516 in1974.
Finally, Krugman conveniently forgets that concerns about global warming are the main reason that corn prices have skyrocketed since 2005. Nowadays 40 percent of corn grown in the United States is used to produce ethanol(乙醇),which does absolutely nothing for the climate, but certainly distorts the price of cornat the expense of many of the worlds poorest people.
Bill Mickbben similarly worries in The Guardian about the Midwest drought and corn prices. He confidently tells us that raging wildfires from New Mexico and Colorado to Siberia are exactly what the early stages of global warming look like.
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