几十年来，危言环境保护主义者一直警告说人类的厄运迫在眉睫，主要由于我们对于地球上自然环境系统的利用不可持续，且对其造成严重影响。
For decades, apocalyptic environmentalists (and others) have warned of humanity's imminent doom, largely as a result of our unsustainable use of and impact upon the natural systems of the planet.
土地是人类生产与生活的载体，是一个国家存在与否的基本特征，也是生态环境系统的重要组成部分。
Land is the carrier of human production and life, which is a basic feature of the national existence, and is an important component of the ecological environmental system.
采用物流核算的方法研究了中国惠州地区与人类活动有关的氮流在环境系统和人类生产生活系统的状况。
By the method of material flow accounting, this paper studied the human activities-related nitrogen flow in the system of environment and anthroposphere in Huizhou region.
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