随着对全球变暖的预言 — — 在几年前还被讥为“杞人忧天”的论调 — — 的反复出现并变得极富争议性，削减温室气体排放的必要性也逐渐变得清晰起来。
The need to cut greenhouse gases has become increasingly clear as predictions of global warming – denounced as “alarmist” when they were first made just a few years ago – have repeatedly turned out to have been too conservative.