土壤侵蚀降低了他们的作物产量。
这是世界上一些主要农作物产量增长速度的下降。
This is the decline in the growth in yields of some of the world's major crops.
更好的灌溉可以显著提高作物产量；目前，全球约40%的粮食供应都来自于灌溉地。
Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.
早在使用机械和化肥之前，勤劳和富有创造性的中国农民就已经采用各种各样的方法来增加农作物产量。
Long before the use of machinery and fertilizers, industrious and creative farmers had already used different kinds of methods to increase crop yields.
实践证明，低耕农业提高了作物产量，减少了用水量；而且，由于有害植物变少了，这种农业对化工产品的需求也降低了。
It has been proved that Low Till Farming increases harvests and reduces water use, and this method reduced the need for chemical products because there are fewer unwanted plants.
在20世纪40年代早期，农民们沐浴在以化学品为基础的集约农业的光辉下，贪心地把杀虫剂当作增加作物产量的一种可靠方法。
In the early 1940s, basking in the glory of chemical-based intensive agriculture, the farmers avidly took to pesticides as a sure measure to boost crop yield.
所有这一切很快就会限制食物产量。
如在亚洲，谷物产量增长，贫困率急剧下降。
提高食物产量只是部分解答了“气候方程序”。
Improving food production solves only part of the climate equation.
在印度的乡下，组织帮助农场主提高作物产量。
In rural India the group is assisting farmers with crop production.
科学家们说，仍然需要增加食物产量的新方法。
But novel ways to increase food production will also be needed, say the scientists.
四川的种植面积占全国的6.1%，谷物产量占全国的6%。
Sichuan \ 's planting area accounts for 6.1 percent of the country \' s, while its grain output accounts for 6 percent of China \ 's.
这比过去的40年少多了，四十年中谷物产量增加了250%。
That is much less than during the previous 40 years, when cereal production rose by 250%.
并且由于丰富的表层土被冲刷掉，土地侵蚀威胁到农作物产量。
And because it washes away rich topsoil, erosion can threaten crop yields.
仅在十年以后，非洲某些地方的农作物产量预计将减少50%。
Just a decade from now, crop yields in some parts of Africa are expected to drop by 50%.
拉美的预演结果相对不错：主要作物产量只会降低几个百分点。
Latin America comes out of the exercise relatively well: the yields of its main crops are expected to fall by only a few percent.
全球性的对生物燃料需求的增加更多地消耗谷物产量并使价格进一步提高。
Growing global demand for biofuels is also eating up grain production, and boosting prices.
罗贝尔将各个地区的气象数据收集起来并整理了同地区的作物产量数据。
Lobell put the climate data from various regions together with the crop yield information from the same areas.
此外，有一个简单的方法或多或少能够消除迄今为止气候变化对农作物产量的影响。
Moreover, there is a simple way more or less to abolish the effect of climate change on yield to date.
更加暖和的气温实际上能够增加北美以及俄罗斯一部分地区的农作物产量。
Warmer temperatures are actually leading to increased crop yields in some parts of North America and Russia.
由于作为六十年来最严重干旱丝毫没有减弱的迹象，农作物产量将大幅下滑。
Crop production has fallen sharply, as the worst drought in six decades shows no sign of letting up.
河水和溪流日渐干涸，农作物产量急剧下降，离春天还远，树木就进入了花期。
Rivers and streams are drying up, crop yields are plummeting, and trees have begun to flower long before spring arrives.
当然了，富裕国家也受到了影响：长期的干旱已经造成澳大利亚农作物产量暴跌。
Of course, wealthy countries are affected: long-term drought in Australia has caused certain crop yields to plummet.
当然了，富裕国家也受到了影响：长期的干旱已经造成澳大利亚农作物产量暴跌。
Of course, wealthy countries are affected: long-term drought in Australia has caused certain crop yields to plummet.
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