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For years, AMERICAN FORESTS has used other technology, like images from the Landsat 7, to show policymakers the alarming rate at which green spaces were being overtaken by gray surfaces. The Landsat 7 Satellite, launched last year, supplies two forms of data -- heat emitted from and light reflected by plants and soil. Recently several satellites like Landsat 7 have observed Earth by remote sensing--scanning from 700 km (435 mi) above the planet. |
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