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Global map of forest height produced from NASA's ICESAT/GLAS, MODIS and TRMM sensors. The map will advance our understanding of Earth's forest habitats and their role in Earth's carbon cycle. (Image credit: NASA/JPL-Caltech)

Global map of forest height produced from NASA’s ICESAT/GLAS, MODIS and TRMM sensors. The map will advance our understanding of Earth’s forest habitats and their role in Earth’s carbon cycle. (Image credit: NASA/JPL-Caltech)