Largest wildlife overpass in North America opens; plus, ‘Rusting rivers’ threatening Alaska’s Arctic after years of permafrost thaw

The wildlife overpass in Douglas County, Colorado, spans Interstate 25 and connects 39,000 acres of habitat, allowing elk, deer, bears, mountain lions and other animals to cross safely. Also, NOAA’s Arctic Report Card shows more than 200 Arctic watersheds in Alaska’s Brooks Range have begun “rusting.” Learn more about your ad choices. Visit podcastchoices.com/adchoices