Remember when Liberal leader Stephane Dion unveiled his carbon tax plan earlier this year? The green lobby was thrilled. It had finally found a mainstream politician ready to fight an election on a promise to implement a tax on heating fuels, diesel and other traditional sources of energy that households consume. Environmentalists were convinced voters would rally around the plan, particularly since the carbon tax and ensuing higher energy prices would be offset with tax cuts targeted to low-and modest-income earners. Canada was set to become a world leader in the climate change debate. Dreams of a carbon tax are...