目前，在世界范围内，80%以上适合种植农作物的土地都在使用中。

At present, throughout the world, over 80% of the land that is suitable for raising crops is in use.

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根据官方预测，照目前的趋势，到2010年，美国的碳排放将飙升至比1990年高出三分之一以上的水平。

If current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third higher than were those in 1990, according to official projections.

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目前20 ％以上的人类感染病理归咎于这种最早出现在2002年的细菌。

The strain first appeared in 2002 and now accounts for more than 20% of human infections.

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