Victor Maus, a researcher in geoinformatics and sustainability at the University of Economics and Business in Vienna, Austria, has spent the last three years pouring over satellite images of the Earth's surface to estimate the total area humans currently give over to mining. The land size of mining had never been surveyed by satellite before, making it tricky to train a computer how to identify mines from thousands of photos. Maus and his team therefore had no choice but to make his estimates by eye, and spent hours tracing polygons around the shapes of open pits, shafts and waste tailings ponds. "I was seeing polygons in my sleep," he says.
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