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Climate change and crops 气候变化与农作物 Hindering harvests 妨害产量 Changes in the climate are already having an effecton crop yieldsbut not yet a very big one 气候变化已经对农作物产量造成影响但是迄今影响不大 May 5th 2011 | from the print edition THE problems climate change looks likely to bring inthe future may increasingly be visible in the recordsof the past. Not just in the far-off ages of surging sea levels following ice-age thaws, spikes inprehistoric temperatures correlated with natural releases of greenhouse gas and ancientcivilisations brought low by drought, but in records from living memorywhich are based onreliable measurements made at the time. Using such data researchers have now compiled anestimate of global changes in crop yields which can be put down to recent increases intemperature and decreases in rainfall . The bad news is that they find that climate changehas lowered the amount of maize and wheat produced in a given area.The good news is that the effect is so far reasonably small. 冰河融化后的远古时代，海平面急剧上升，由于温室气体的自然释放，气温处于史前时代最高峰，古代文明由于干旱而衰落。在记忆可及的近代，人们根据可靠的测量对气候变化做了记录。根据过去的这些记录，气候变化可能造成的影响，在未来也许会越来越明显。研究人员利用这些数据，现在已经对全球农作物产量的变化做出了估计。农作物产量变化的原因可能是近来气温的升高和降水的减少。消息有好有坏。坏消息是，他们发现，在上述地区气候变化使玉米和小麦减产。好消息是，迄今为止气候变化的影响相当小。 | 
