LiveScience: rolonged droughts are causing more trees to die in forest fires in the western United States, according to a new study that looked at decades of controlled fire data. Climate change is heating up and drying up the American West, and these two changes are weakening trees, which makes them less able to resist the effects of fire, the authors of the study conclude. "What we're interested in is trying to understand what the climate might be in relation to a fire event," Phil van Mantgem, a research...