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PBS News Hour
A border wall can take a heavy toll on endangered wildlife
One of President Trump’s key promises rests on building a wall across the U.S.-Mexico border. But how would a continuous barrier stretching from California to Texas affect the wildlife that live there? At least 50 species near the border are already endangered and scientists worry a wall will only accelerate extinction for some. William Brangham reports from the Sonoran Desert in Arizona.
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