早在一万年以前，地球上有三分之二的陆地仍被森林覆盖；而现时，地球上的森林已由那时的76亿公倾减少到28亿公顷，如今仍以每年2000万公顷的速度日益减少。科学家断言，如果森林从地球上消失，其后果必然是：陆地生物的99％将灭绝，约有450万个物种将不复存在。全世界的90％的 As early as 10,000 years ago, two-thirds of the Earth’s land was still covered by forests. At present, the forest on Earth has been reduced from 2.8 billion hectares of the time to 2.8 billion hectares. At present, 20 million hectares The speed is decreasing day by day Scientists assert that if forests disappear from the earth, the consequences must be: 99% of terrestrial organisms will become extinct and about 4.5 million species will cease to exist. 90% of the world’s