In protecting land for wildlife, size matters—here's what it takes to conserve very large areas

At a global scale, conservationists have done a remarkable job of conserving land, creating over 6,000 terrestrial protected areas per year over the past decade. But small has become the norm. The average size of newly created protected areas over that time frame is 23 square miles (60 square kilometers), down from 119 square miles (308 square kilometers) during the 1970s.

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