Using NASA's Landsat satellites, scientists have been able to assess how Earth's surface has changed from 1972 to the present. One example of how Landsat was used to study a "landscape of thawing permafrost" that resulted in coastal erosion and lake evolution in Cape Halkett, Alaska from 1955-2005 is described here and in a two-page pdf with accompanying satellite image. Additional Landsat images of the region can be found here.
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