Wild elephants roam across the crowded plains of India; forested river banks wind through cattle ranches in Brazil; a ribbon of green stretches across Europe where the Iron Curtain used to be. Such wildlife corridors linking up larger but isolated protected areas are the most widely adopted strategy for halting biodiversity decline, with tens of millions of dollars spent creating and protecting them every year. But do they work? Has enthusiasm for a neat idea got ahead of the science? Might corridors sometimes do more harm than good?The principle is simple. As wildlife habitat is broken into isolated fragments by farms, roads and settlements, we need to link them up with corridors of green.
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