Although the US and China are the world’s two primary producers of greenhouse gases – the US being the largest – neither has signed the Kyoto Protocol, which commits countries to cut carbon emissions 5% below 1990 levels by 2008-12. With China and the US out of the picture, the problem will likely get far worse before it gets better.
虽然美国和中国是世界上两大主要的温室气体排放国，美国的排放量位居世界第一，但是双方都没有签署京都协定书。京都协定书要求参与国到2008-2012年时将碳排放量与1990年相比降低5%。因为中国和美国置身事外，这个问题很可能在有所改善之前就恶化得一塌糊涂。