ScienceDaily: Fire’s potent and pervasive effects on ecosystems and on many Earth processes, including climate change, have been underestimated, according to a new report. “We’ve estimated that deforestation due to burning by humans is contributing about one-fifth of the human-caused greenhouse effect — and that percentage could become larger,” said co-author Thomas W. Swetnam of The University of Arizona in Tucson. “It’s very clear that fire is a primary catalyst of global climate change,” …