第1个回答 2013-03-09
Due to deforestation and other man-made factors, forest area in the whole world in the year 1990 to 2000 years ten years an average reduction of 9400000 hectares. The expert points out, this phenomenon has caused a serious impact on human survival of the natural environment, should take immediate and effective measures to control. According to the French in the latest issue of " science " magazine and the future, at present, the world forest area has been reduced to 3870000000 hectares, accounting for 30% of the earth's surface, the equivalent of 0.6 hectares per capita. The magazine quoted statistics released the relevant UN agencies said, in the past ten years, the world forest natural growth and planting area is only 5200000 hectares per year, while deforestation area is as high as 14600000 hectares, serious " run behind one's expenses ". The afforestation, the magazine said, afforestation only in recent years, artificial afforestation area is only accounted for 5% of the world's forest area, and more than half of the growth of less than 15 years. In addition, afforestation action did not cause the attention of the whole world, the development of all countries and regions is very uneven, such as Asia 2000 planting area accounts for the global current planting area of 62%, the highest in the region of the world, while the rest of the world is very inferior. The expert thinks, reduce forest and soil surface vegetation can not only cause land degradation and climate change, but will also have a serious impact on the whole ecological balance