In the United States alone, over 100 million cell-phones are thrown away each year. Cell-phones are part of a (grow) mountain of electronic wastes like computers and personal digital assistants. electronic waste stream is increasing three times faster than traditional garbage as a whole.
Electronic devices contain valuable metals such as gold and silver. A Swiss study reported that while the weight of electronic goods (represent) by precious metals was relatively small in comparison to total waste, the concentration (含量) of gold and other precious metals was (high) in so-called e-waste than in naturally occurring minerals. Aside that, electronic wastes also contain many poisonous metals. Even when the machines are recycled and the (harm) metals are removed, the recycling process is often carried out in poor countries where many poisonous substances (allow) to escape into the environment, or in practically uncontrolled ways make more wastes generated.
The U. S. Environmental Protection Agency notes that most wastes are so dangerous that the tough (restrict) are supposed to be put on the production, distribution, and use of electronic products, aimed (tackle) this problem to the greatest extent.
