地球的生态资源总是处于变化之中。这种变化大体是两类因素引起的。一类是来自生态资源之间或生态资源内部的相互作用(如各种灾变);一类是来自人类的直接或间接影响。前一类作用引起的变化,通常是正常的自然变化过程。人类活动对自然的影响,既可以表现为正面效应,即促使的效应,又可以表现为负面效应,即导致其退化的效应,也可以理解为生态破坏。往往有这样的情况,人的一些行为在短时期内看似有利,但随着时间的推移,它的负面效应逐渐显现出来。对生态环境变化的自然因素和人为因素应依据两条原则进行判断:①是否有利于人类的持续发展;②是否有利于人类所依赖的生态资源的持续存在和演进。
The ecological resources of the earth are always changing. This change is caused by two kinds of factors. One is from the interaction between ecological resources or within ecological resources (such as various disasters); the other is from the direct or indirect impact of human beings. The change caused by the former kind of action is usually a normal natural change process. The impact of human activities on nature can be expressed as both positive effect, promoting effect and negative effect, that is, the effect that leads to its degradation, as well as ecological damage. It is often the case that some human behaviors seem to be beneficial in a short period of time, but with the passage of time, its negative effects gradually appear. The natural and human factors of ecological environment change should be judged according to two principles: ① whether it is conducive to the sustainable development of human beings; ② whether it is conducive to the sustainable existence and evolution of the ecological resources on which human beings depend.
【怎样防止土地荒漠化】相关文章:
★ 高二英语作文精彩范文250字:A trip to Rio De Janeiro
★ 特别的一天
★ 高二英语作文精彩范文350字:An unforgettable experience