As one scientist friend puts it: if you are driving on a mountain road, approaching a cliff, in a car whose brakes may fail, and a fog bank rolls in, should you drive more or less cautiously? Global warming is one of those rare instances where the scientific community is more fearful of what may be happening than the population at large.
可仍然有人建议说由于还不清楚全球变暖的情况究竟有多严重，我们应该静观其变甚至无所作为。在我看来，不确定性应该使我们今天更坚定地采取行动。正如我的一个科学家朋友所说：如果你在一条山路上开车，驶向一处悬崖，而汽车的制动系统可能有问题，又正逢山雾弥漫，你应该开得更谨慎还是更随意呢？全球变暖是少数几个令科学界比令大众更担心的问题。科学家们已经窥见了未来。