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一、惊人的毁林速度:在四、五千年前,地球三分之二的陆地面积生长着茂密的森林,总面积为76亿公顷。1863年以前,全世界毁林21亿公顷,平均每年毁林21万公顷。1863年至1963年,全世界毁林17亿公顷,平均每年毁林1700万公顷,增加81倍。1963年至1978年,全世界毁林7亿公顷,平均每年毁林4600公顷,增加220倍.
First, the alarming rate of deforestation: Four to five thousand years ago, two-thirds of the earth’s land area grew dense forests with a total area of 7.6 billion hectares. Before 1863, the world destroyed 2.1 billion hectares of forests and deforested an average of 210,000 hectares annually. From 1863 to 1963, 1.7 billion hectares were destroyed in the world and an average of 81 times more were deforested each year by 17 million hectares. From 1963 to 1978, 700 million hectares were destroyed in the world, with an average of 4600 hectares destroyed each year, an increase of 220 times.