Earth's Evolution

Three decades of space photos reveal stunning changes

You can't let earth out of your sight for a second. Just when you think you know the look of your coastline, the lay of your forests, the reach of your glaciers, they go and change on you. That was true even before humans arrived, but our constant building, drilling, clear-cutting and climate changing have accelerated the process.

The past 40 years of that relentless terraforming have been captured by the Landsat satellites, which have been in orbit since 1972. Millions of the pictures they've taken since 1984 have been digitally cleaned up by Google, and a sampling is being shared...

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