July 4, 2008, Scientists say wildfires in northern Saskatchewan could go "pyro" this weekend, sending ash, smoke and gases soaring more than 10 kilometres up into Earth's upper atmosphere. As CanWest News reports, it is one of the more spectacular ways nature regenerates the northern boreal forest  and one with such far-ranging implications that NASA has two research planes and 120 scientists in Cold Lake, Alta., tracking the blazes. READ MORE