第一步，也是最重要的一步，是要将全球变暖控制在看似不可避免的两摄氏度的范围之内，如果超出这个幅度，它所带来的环境灾难就会使贫困和脆弱国家无法承受。
This requires, first and most importantly, reducing global warming to the apparently inevitable increase of two degrees Celsius, beyond which lies an environmental catastrophe that could be unmanageable for poor and vulnerable countries.