NBC: Leading climate scientists on Thursday issued their annual physical of Earth, comparing the planet in 2013 to a patient that's only getting worse and highlighting problems with key vital signs: from record warmth in Australia and China to sea levels that continue to rise and Arctic sea ice in continued decline.
The vital signs reflect "the largest changes that we've been able to witness in the historical record," said Tom Karl, director of the National Climatic Data Center, part of the National...