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Human-caused greenhouse gas emissions are like a cat burglar. They're hard to see and harder to catch in the act. However, they're prone to leaving fingerprints, and scientists, acting as detectives, have been looking for those fingerprints as evidence has mounted that greenhouse gases are causing global average temperatures to increase. The latest discovery, announced in a journal article, makes the case that those emissions are causing changes to the climate in the lower and upper reaches of the atmosphere. [Source: Climate Central]
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