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A global treaty called the Minamata Convention requires gold-mining countries to regularly report the amount of toxic mercury that miners are using to find and extract gold, designed to help nations gauge success toward at least minimizing a practice that produces the world’s largest amount of manmade mercury pollution. But a study of baseline mercury emission estimates reported by 25 countries – many in developing African, South American and Asian nations – found that these estimates rarely provide enough information to tell whether changes in the rate from one year to the next were the result of actual change or data uncertainty. <br/><br/>