Chu stated that like 1950s scientists who at first could only draw crude correlations between cigarette smoking and lung cancer, when he first began researching global warming there was great uncertainty about its severity and impact.
朱棣文表示，他剛開始研究全球暖化議題時，就如同 1950 年代的科學家，只是籠統地把吸煙與肺癌劃上等號一樣，並不確知其影響與嚴重性。