There are upsetting parallels today,as scientists in one wave after another try to awaken us to the growing threat of global warming. The latest was a panel from the National Academy of Sciences,enlisted by the White House,to tell us that the Earth's atmosphere is definitely warming and that the problem is largely man-made.The clear message is that we should get moving to protect ourselves.The president of the National Academy,Bruce Alberts,added this key point in the preface to the panel's report：“Science never has all the answer. But science does provide- us with the best available guide to the future,and it is critical that our nation and the world base important policies on the best judgments that science can provide concerning the future consequences of present actions.”

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　　現(xiàn)在，由于科學家一次又一次地試圖喚醒我們正視全球逐漸變暖的威脅，令人憂慮的相似景象又卷土重來。最近，一個由白宮召集的全國科學協(xié)會小組表示，地球的大氣肯定在變暖，而且這個問題主要是人為的。確鑿的信息是，我們應當行動起來保護自己。全國協(xié)會的會長Bruce Alberts在該小組的報告前言上附加了這個要點：“科學永遠不會找到所有答案。但是，科學的確為我們提供了走向未來的最佳指導。(現(xiàn)在)至關重要的是，我們的國家和我們這個世界將自己的重要政策置于最科學的判斷之上，這些判斷是科學界就(人類)現(xiàn)今行為的未來后果所作的最佳判斷。”