In this interview, environmental geographer Paul Robbins and environmental historian William Cronon talk about humanity's impact on the world and the implications of attempting to protect certain patches of land. "In the last 30 years, the number of protected areas has tripled around the world and the average size of them is about half as big as they used to be, which means we're setting aside more and more small areas that are heavily influenced by people," Robbins said.

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