随着人类数量的增长，这种变化的速度也越来越快。
Wilson计算出了单位面积上的人类数量已经百倍于任何其他在地球上行走的大的动物物种。
Wilson calculates that human biomass is already a hundred times larger than that of any other large animal species that has ever walked the Earth.
20世纪地球的人类数量增长了293%，此前的9个世纪平均仅为22%，农民数量显然跟不上总人口的增长。
Earth's human population grew 293 percent in the 20th century - compared with an average of 22 percent each of the previous nine centuries - and farmers couldn't keep up.
应用推荐