美国工业的发展,人口的增长使垃圾和废品堆积如山。据统计,美国城市垃圾和废品每年多达3.6亿吨,其中各类罐头1200亿筒,易拉饮料罐690亿筒,可谓世界之冠。但是,随着科技的发展,美国广大科学工作者利用各种办法,对垃圾进行了处理和利用,变废为宝,造福于人类,并立法把它作为一项重要的环境保护工作。与此同时,空罐头和废品垃圾已成 With the development of American industry, the growth of population has caused the accumulation of rubbish and waste products. According to statistics, there are as many as 360 million tons of municipal waste and waste products in the United States each year, including 1,200 billion cans of canned food and 69 billion barrels of cans. However, with the development of science and technology, the majority of scientific workers in the United States have used various methods to dispose of waste and use it to turn waste into treasure, benefiting humanity, and legislating it as an important environmental protection work. At the same time, empty cans and waste products have become