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[匿名]

2009-12-19 10:24 pm

put a word in ____

Scarce Fertility
Today __1__ than six billion people rely on food grown on just 11 percent of the global land surface. Even less groud --- a scant 3 percent of the Earth's surface--- offers inherently fertile soil. Soil degradation can transform productivity zones ___2____
wastelands with tragic speed.
By 2030, 8.3 billion people __3___ walk the Earth, and farmers will have to grow 30 percent more grain. Evenas humankind is increasing its demands on soil, we are destroying it faster __4__ ever before. We have degraded __5__ area of land the size of the United States __6__ Canada combined.

回答 (1)

rhdiddl

2009-12-20 1:37 am

✔ 最佳答案

Scarce Fertility

Today [more] than six billion people rely on food grown on just 11 percent of the global land surface. Even less ground --- a scant 3 percent of the Earth's surface--- offers inherently fertile soil. Soil degradation can transform productivity zones [into] wastelands with tragic speed.

By 2030, 8.3 billion people [will] walk the Earth, and farmers will have to grow 30 percent more grain. Even as humankind is increasing its demands on soil, we are destroying it faster [than] ever before. We have degraded [an] area of land the size of the United States [and] Canada combined.

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