CNN: Think of it as a giant barometer for climate science. With a new groundbreaking study on climate change seemingly coming out every other week, it can be hard to keep up with the latest findings. Fortunately, every five to six years, the United Nations sums it up in a comprehensive report. That's what's going on this week in the Swedish capital Stockholm, where the latest Assessment Report from the Intergovernmental Panel on Climate Change is set for release on Friday. The document will bring together...