Summit Voice: Watching climate change is a little more subtle than just sitting around watching a thermometer, but sometimes even scientists are surprised at just how fast things are changing.
A group of East Coast university researchers probably felt that way as they studied the breeding areas of Carolina and black-capped chickadees. Along a narrow zone in the eastern U.S., the two species interbreed, and that overlap zone is moving northward at 0.7 miles per year -- a full-on sprint by geological time standards....