CARTHAGE, Tenn. - Al Gore has profited from zinc mining that has released millions of pounds of potentially toxic substances near his farmstead, but there is no evidence the mine has caused serious damage to the environment in the area or threatened the health of his neighbors. Two massive white mountains of leftover rock waste are evidence of three decades of mining that earned Gore more than $500,000 in royalty payments for the mineral rights to his property. New owners plan to start mining again later this year, after nearly four years of inactivity. In addition to bringing 250 much-needed...