How do we know what Earth's climate was like long ago? If you look closely, there are clues just about everywhere across our globe. Some are easy to see and others are more subtle. @NASAClimate scientist Dr. Gavin Schmidt explains.
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How do we know what greenhouse gas and temperature levels were in the distant past? – Climate Change: Vital Signs of the Planet
Vital Signs of the Planet: Global Climate Change and Global Warming. Current news and data streams about global warming and climate change from NASA.Climate Change: Vital Signs of the Planet