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[music]

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2000 - 2009.

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It was the warmest decade on modern record.

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How do we know? It's what we do.

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NASA has missions monitoring climate. Theyr'e up there right now - gathering data,

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analyzing trends, and sharing both raw data

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and with results with everyone. For free.

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Why are temperatures rising? Why aren't changes the same everywhere?

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How are humans contributing to climate change? What changes are already occuring today?