Trump's divided desert: Wildlife at the border wall.
President Trump's promise to build a "great wall" along the US-Mexico border remains one of the central and most controversial promises of his presidency. But scientists from the University of Arizona are starting to unravel the effect that such a wall could have on a desert ecosystem it will cut through. The team is studying wildlife in the Sonoran Desert, which stretches across the border from Arizona into Mexico and is already divided by a barrier at the border. BBC science reporter Victoria Gill joined the team in a search for some of the desert's most endangered animals.
http://www.bbc.com/news/science-environment-39888754?SThisFB
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