Around the globe, experts are racing to solve a series of mysteries: how could a one-degree rise in average temperature have profound effects around the globe? How could crumbling houses in New Orleans be linked to voracious creatures from southern China? Hosted by actor-writer-director Edward Norton, this award-winning series uses state-of-the-art graphics and globe-spanning investigations to understand how our environment is changing and why. Frogs are vanishing in America's heartland. Canadian beluga whales are mysteriously dying in the Saint Lawrence River. Swarms of sea stars are overrunning parts of Australia's Great Barrier Reef. Are these signals that something is amiss in Earth's water – from our marshes to the sea? Has water become a massive delivery system for pollutants?