据联合国环境署资料,全世界森林总面积约为47亿公顷。占世界陆地总面积的32％。1985年发达国家为19.20亿公顷,发展中国家为22.27亿公顷。森林中木材的总贮量估计为3400—3600亿立方米。从全球看,世界森林每年以1500万公顷的速度在消失,大部分是在非洲、亚洲和拉丁美洲的潮湿地区。在热带国家,每年平均森林砍伐的速度估计为1100万公顷。非洲国 According to the United Nations Environment Program, the total area of ​​forest in the world is about 4.7 billion hectares. Accounting for 32% of the total land area of ​​the world. In 1985, the number of developed countries was 1,920 million hectares and that of developing countries was 2,227 million hectares. The total stock of wood in the forest is estimated at 34 to 3600 billion cubic meters. Globally, the world’s forests are disappearing 15 million hectares annually, mostly in wet areas in Africa, Asia and Latin America. In tropical countries, the average annual rate of deforestation is estimated at 11 million hectares. African countries