In Africa, Thomas Friedman finds an increasing population of refugees fleeing wars, rising sea-levels and hurricanes. Don Cheadleexplores how governor Jerry Brown is fighting the historic California drought while also fighting climate change. A Central Valley scientist shows Cheadle the danger of a global water and food crisis.

Ty Burrell looks into the progress of electric vehicles (EVs) and automated vehicles, from Silicon Valley's technology innovators to Atlanta, Georgia, where generous EV incentives were recently killed. Arnold Schwarzenegger explores how the military is adapting to climate change by increasing energy efficiency and using renewables. In Kuwait, he sees how fuel convoy's are responsible for most US soldier deaths.

Joshua Jackson travels to the Philippines and Australia's Great Barrier Reef to investigate the impacts of climate change on our world's oceans and the millions of people who rely on their ecosystems for their livelihood.