How do we measure changes to Earth's environment?

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What are Climate Data Records and Terrestrial Essential Climate Variables?

Global climate is changing. USGS is using remote sensing data to help develop new climate information products called Essential Climate Variables (ECVs) and Climate Data Records (CDRs). Together, USGS CDRs and ECVs can provide an authoritative basis for regional to continental scale identification of historical change, monitoring of current conditions, and predicting future scenarios.

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