目前对人的生命经济价值的估算方法基本上可以分为两大类：人力资本法和支付意愿法。
At present, there exist two approaches to the economic valuation of life: human capital and willingness to pay (WTP).
生态系统功能是地球生命系统的支持系统，为人类创造赖以生存的生态环境条件，有巨大的直接与间接经济价值。
The biosphere of the Earth is essential to human survival and development. The services of ecosystems are critical to the functioning of the Earth's life-support system.
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