NBC: Experts are more certain than ever that human activity is changing the global climate, even though they don't fully understand every detail of the climate system, according to a new report released Wednesday by two of the world's leading scientific bodies.
The document from the U.S. National Academy of Sciences and the United Kingdom's Royal Society aims to move the climate change debate beyond humans' role in global warming to a discussion of how to limit the impacts on society.
"Climate change...