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案头摆着这样一组数字:全世界的人口目前正以每年八千万人的速度增加,而与此同时,地球上的森林正以每年二千万公顷的速度减少,近三十年来已经减少了一半;全世界平均每年沙漠化的土地面积正以每年五至七万平方公里的速度扩大;地球上的野生物(动植物)正以每天灭绝一种的速度消失,目前已灭绝了二百八十种哺乳类动物,三百五十种鸟类和二万种植物;地下的能源正以每年八十亿吨标准煤的速度被开采出来,消费掉;而由于缺少干净的饮用水,每天都有二万五千人死于同饮用水有关的各种疾病……
The table shows a set of figures: the world’s population is currently growing at 80 million people a year, while at the same time the earth’s forests are declining at a rate of 20 million hectares annually for the past 30 years Half; the average yearly desertification of land in the world is expanding at an annual rate of 500,000 to 70,000 square kilometers; the wildlife (animals and plants) on Earth are disappearing at a rate of extinction a day, and at present two hundred and eighty Ten species of mammals, 350 species of birds and 20,000 species of plants; underground energy is being mined and consumed at a rate of eight billion tons of standard coal a year; and every day due to lack of clean drinking water Twenty-five thousand people have died of various diseases related to drinking water ...