But existing climate models show we can do little about it. Even if everyone (including the United States) applied the Kyoto rules and stuck to them throughout the century, the change would be almost immeasurable, postponing warming for a mere six years in 2100 while costing at least $150 billion a year.
全球变暖是真实的威胁，并且是由二氧化碳的排放造成的。但现有的气候模式表明我们对此却几乎无能为力。即便所有国家（包括美国）都遵守京都议定书的相关规定并在这个世纪严格执行，其所带来的气候改变也微乎其微，到2100年时也只是以每年1500亿美元的代价将变暖推迟了6年而已。