Nature photography, political rants, and Martyman laughs from the ten-time award-winning author of "Cool Creatures, Hot Planet," "Endangered Edens," and the "Time Is Irreverent" series.

Sinking into permafrost

Dawson City Permafrost

Marty’s photo of the day #1828: I took this photo in Dawson City, Yukon. These buildings date from 1901. This is what happens when you build atop permafrost and add heat. The permafrost melts, and the footings sink—all at different rates.

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