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If you compare some of the photographs which can be found on NASA’s website, you can really see how human beings have changed the appearance of our world over the years. The time difference between these images ranges from five to 100 years. Incredible stuff.

#16.

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Pedersen Glacier, Alaska. Summer, 1917 — summer, 2005

#15.

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Aral Sea, Central Asia. August, 2000 — August, 2014

#14.

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Carroll Glacier, Alaska. August, 1906 — September, 2003

#13.

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Powell Lake, Arizona and Utah. March, 1999 — May, 2014