Gold mining using mercury is already illegal and yet as many as 15 million people worldwide may rely on this as their sole source of income. Phasing out mercury is a significant global challenge with potential economic and social repercussions.
http://www.mercury2013.com/news/Mercury-UNEP's-%E2%80%98Pollutant-of-Greatest-Global-Concern%E2%80%99/58/
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