单项选择题

Dangerous forms of waste often are created from the chemicals used for industrial processes. During the past few years, with more places of the world industrialize and more new products are produced, the amount of the chemicals has increased seriously. Each year over 80,000 different kinds of chemicals are used in industries, which produce hundreds of millions of tons of harmful waste around the world. It is very difficult and expensive to eliminate these chemicals or to store them in a particular way that doesn’t damage human life and the environment.
Harmful waste every year causes many major health problems. However, it is often after some serious event has happened that governments will take actions and cut down the levels of dumped harmful waste. In 1989, a school in New Jersey had to be closed because the students there had suffered too much exposure to chromium(铬). Later it was known that large amounts of chromium had been dumped nearby and blown around the school.
Many researches have been done to get information on the effects of different chemical. Since waste chemicals always have been mixed together, it will also be essential to learn what the influence of the combinations of these chemicals is. It has been realized by some government that the problem is very serious. They are trying to make laws to get rid of harmful waste. They are also trying to make limitation on the amount of industries that often release harmful waste.
Both the governments and public must contribute to the solution. In order to affect policy makers, they can choose not to buy those products that need the production of harmful waste, and produce less harmful waste themselves. It has been said by many scientists that waste production can be reduced. The waste can be cut down by at least one-third by using existing technologies.

What can be learnt from the passage（）。

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