Worth a Thousand Words

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Science  02 Aug 2013:
Vol. 341, Issue 6145, pp. 482
DOI: 10.1126/science.341.6145.482-a

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Although repeat photographs of receding glaciers yield perhaps the most iconic images of climate change, such before-and-after images can also document more subtle biological shifts. By comparing historic images with modern photos snapped at the very same spots, researchers are documenting biological change that might be otherwise invisible in Ethiopia, China, Sweden, and the Arctic. Realizing the potential of repeat photography isn't easy, but all the effort can be worth it. Photo comparisons have yielded numerous insights and a few surprises. In this article, Science takes a look at a few projects that use photos to go back in time.