Inter Press Service: The massive wildfires that roared and twisted their way through southern California in 2007 are a glimpse of what a future of global warming may hold, scientists say. The western U.S. can expect to see more "mega forest fires" of over 100,000 acres due to an increase in greenhouse gases, says Thomas Swetnam, director of the Laboratory of Tree-Ring Research at The University of Arizona in Tucson. "Lots of people think climate change and the ecological responses …