"We're not saying yields have gone down, just to make this clear," Schlenker says.

“我们并不是说产量在下降，只是要澄清一下，”schlenker说。

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Schlenker said this was because the rise in temperature there was very small compared to other parts of the world.

Schlenker说，这是由于美国地区温度上升的幅度相对于世界的其它地方相比较小。

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One of the researchers was economist Wolfram Schlenker at Columbia University in New York and the National Bureau of Economic research.

经济学家Wolfram Schlenker是其中的一位研究人员，供职于纽约哥伦比亚大学和美国国家经济研究局。

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One of the researchers was economist Wolfram Schlenker at Columbia University in New York and the National Bureau of Economic Research.

VOA: special.2011.05.17

In research that Wolfram Schlenker and I have conducted using the Hadley III climate model, we project yield declines of about 20% over the next 20 years, holding all else the same.

CNN: Extreme heat and droughts -- a recipe for world food woes

Earlier work by Dr Schlenker has showed that plants have skewed preferences: they dislike temperatures beyond the optimum more than they dislike temperatures below the optimum, so increasing warmth can have worsening effects beyond a certain point.

ECONOMIST: Climate change and crops