题目

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Lead deposits, which accumulated in soil and snow during the 1960’s and 70’s, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining.
In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different f

提问时间：2021-03-18

答案

复制铅存款、可积聚在土壤和雪在1960年和70,都是造成温室气体排放含铅汽油发源于美国.摘要近20年来《清洁空气法案》已经使用无铅汽油授权,在美国全球领先积累有明显的减少.最近公布的一项研究表明,在《自然》杂志的...