Hotter, larger fires turning boreal forest into carbon source: research

Bigger, hotter wildfires are turning Canada's vast boreal forest into a significant new source of climate-changing greenhouse gases, scientists say. The shift, which may have already happened, could force firefighters to change how they battle northern blazes, said Merritt Turetsky, an ecologist at the University of Guelph and co-author of a paper that appeared in the science journal Nature on Wednesday. "It's making it much more difficult for us to target those reductions in human emissions bec