The canary in the coal mine of climate change

This smattering of coral atolls with a population of about 68,000 is best known as a former U.S. nuclear testing site – until now. These days, scientists, advocates and locals point to this remote land as a harbinger of climate change. Rising sea waters are eating away the land, which has become sterile with salt. Locals are wondering if they can stay – and for how long. Tune in to the full episode Sunday, June 28 at 9:30 p.m. ET.