There are two approaches in the evaluation of such project, one is ecological system services evaluation, and the other is the integrated evaluation.
目前评价退耕效益可采用以下两种思路：生态效益经济价值化法与综合评价法。
All economic activities degrade "ecological system services" - they all require energy and materials from the earth and return as wastes to the earth and atmosphere increasing disorder.
所有的经济行为都阻碍“生态系统服务”——因为所有的经济行为都需要获取能源和材料却返回废弃物，这种循环破坏了地球和大气的正常循环。
The services of ecological system and their natural capital stocks involved are critical to the function of the Earth's (life-support) system.
生态系统服务和产生这些服务的自然资本对地球生命支持系统的功能有着极其重要的作用。
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