The last couple of years have certainly felt unusually hot in many parts of the U.S., but are they really all that unusual?
Many people wonder whether a warming climate is turning up the temperature or whether it's all just part of the normal variation in the weather. Among scientists, there's a growing view that these latest heat waves are indeed a result of climate change.
With no permanent residents, Antarctica is often a forgotten place. But not for Colorado State University soil ecologist Diana Wall. She's been a keen observer of one of the smallest animals now struggling to live in a place that’s still cold—but is beginning to warm.