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Mercury and lead are widely used in nowadays economy. However, by using tin se toxic metals, we disperse them around the planet, pollute it and, since they are not biodegradable, threaten future generation with unsafe environment. The other side of the problem is that they are nonrenewable resources and therefore current estimates suggest that, at present levels of consumption, there is enough lead for 58 years and mercury for 46 years, to mention just a few of the best known heavy metals. A role of these metals in the total environment is discussed in the paper.
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