Why are the world's forests burning? Why did uncontrollable fires cut a 7,700-sq.-mi. swath of devastation across Indonesia? Why have the blazes of Mexico sent plumes of smoke across Texas and Louisiana?
Here's the simple answer: El Nino. While that notorious weather system flooded some regions, it produced horrendous droughts in other areas, making half the world a tinderbox.
But that's too easy an explanation. Scientists suspect that something more fundamental--and frightening--is happening. In one country after another, flames are going where they've never gone before. "These fires are burning into virgin, humid forests that have evolved without fire," says Nels...