Burnaby News Leader: U.S. environmentalists will closely watch B.C.’s election results Tuesday to track the fate of the continent’s first carbon tax. As with many B.C. green groups that back the Liberal-imposed carbon tax and have criticized NDP opposition to it, there’s a sense south of the border the policy measure may become politically toxic if the Campbell government falls. The Seattle-based Sightline Institute recently called the tax one of the best climate control policies in the world and …