Sunday, March 2, 2014

NASA Images of Change

The NASA Images of Change gallery shows a bunch of before and after pictures of places that have experienced some dramatic change. Some of the pictures are from space, while other are from the ground. The two pictures below are from the gallery and show the glacial retreat of Pedersen Glacier in Alaska. The image on the left is from 1917 and shows the glacier filling the frame. The picture on the right is from approximately the same spot (compare background features in the two pictures) and show a lush meadow where the glacier use to be. What remains of the glacier is visible in the center left part of the picture.

The gallery has hundreds of these picture pairs. Not all of the changes are due to climate change, such as before and after pictures of reservoirs. They are interesting and illustrate just how much of an effect we have on our planet.

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