世界人口数量的继续增长和地球上森林面积逐渐减少,引起人们对森林资源和能源的关切。特别是今后五十年,能源情况的改变和日益迫近的木材短缺,很多国家将增加森林的开发。在这个时期,地球人口至少增加一倍,也许增加两倍。(图一)假定至2100年人口稳定,在发展中国家平均每人需材量的增长比发达国家少。 The continued growth of the world’s population and the declining forest area on Earth have raised concerns about forest resources and energy. In the coming 50 years, in particular, the energy situation is changing and the growing shortage of timber is threatening the development of forests in many countries. During this period, the Earth’s population has at least doubled, perhaps doubling. (Figure 1) Assuming a stable population by 2100, average demand per person in developing countries will grow less than in developed countries.