Toronto Star: Under the lush green grass of a promising election harvest on climate change is a carbon tax minefield that could cost Stéphane Dion the next federal campaign if it is not navigated carefully. Two recent Harris/Decima polls confirm that if the Liberal leader proceeds with a tentative plan to place a carbon tax at the centre of his platform, he will be taking a promising but unforgiving election path with little room for missteps. Taken together, the findings validate both the …