The glaciers at Glacier National Park are rapidly shrinking. In fact, they’re melting so fast that the glaciers that can be seen today represent just one-sixth of the number of the icy bodies that were in the same park just 150 years ago.

It is imperative that scientists measure glaciers and follow their changes, and this is exactly where repeat photography kicks in.

By going to the same spot where a photo was taken a long time ago and recreating the composition, scientists are able to quickly learn (and share) how the landscape has changed over time.

The results, unfortunately, are alarming.

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