@Revkin tweets related to: Photo, Nasa,  swift, Greening in, Arctic

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NASA: Swift rate of greening in and around Arctic as area with wide extent of seasonality (winter/summer difference) shrinks in warming climate. Related coverage of the emergence of "pop-up forests" in Arctic on Dot Earth.
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Photo: NASA: Swift rate of greening in and around Arctic as area with wide extent of seasonality... http://t.co/bCnyJSziVc

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