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… to protect human health and the environment against adverse effects resulting or likely to result from human … the ozone layer in a manner that is likely to result in adverse effects on human health and the environment, … and consumption of those substances in 1986; with effect from 1 January 1993, the twelve-month control period …

… before emissions reductions begin to have a demonstrable effect on mercury levels throughout the environment and in … of regional emissions to deposition which may result in adverse eff ects and the potential benefi ts from reducing … more stringent regulations in several countries have the effect of reducing mercury emissions from coal burning …