A woman cleans her pen at a sea cucumber reserve in Madagascar. | Nicky Milne/Thomson Reuters Foundation

Future of Food: San Diego

The U.S. is the largest importer of seafood, with 91 percent of our seafood coming primarily from China. As the global demand for food is expected to double by 2050, researchers are turning to aquaculture to look for ways to breed, raise and harvest seafood in sustainable — and scalable — fish farms off the U.S. coast to improve our access to quality seafood without the carbon footprint of imported fish. This segment explores efforts to build the first open-ocean fish farm in the United States. Proponents say we could have the ability to farm as much as the total global wild catch within an area the size of Lake Michigan. Experts weigh in on whether innovation in aquaculture is outpacing federal regulation and threatening local fishing culture.

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America’s Dirty Secret: Coal Ash

In Juliette, Georgia radioactive water flows from the tap. In Pennsylvania, three adjoining counties battle a rare form of cancer. One thing these communities have in common is their exposure coal ash. Coal combustion powers 40 percent of America’s electricity but generates 130 million tons of coal ash each year. Though it is known to contain carcinogens, coal ash is often dumped in unlined ponds where it leaches into groundwater. There is no federal coal ash regulation on the books—only a patchwork of state level standards.

Toxic Futures: Untold Stories of Chemical Pollution

(Earth Focus: Episode 56) Exposure to toxic chemicals affects people in both the industrialized and developing world. Earth Focus looks at how Toms River, a New Jersey town, fought back to save its drinking water from toxic waste dumping by dye manufacturer Ciba Geigy and by Union Carbide. Then, a look at the new film Amazon Gold, which addresses illegal gold mining in Peru and its tragic impact on human health and the environment.

Nuclear Power: America Goes Naked

"Going naked" is how the insurance industry describes not having insurance. And when it comes to the worst hazards of nuclear power — America is going naked. Correspondent Miles Benson investigates why the U.S. nuclear power industry is underinsured by hundreds of billions of dollars. He also speaks with Australian physician, author and nuclear industry critic Dr. Helen Caldicott on the health effects of nuclear radiation including cancers, fetal damage and genetic mutation.

Restoring The Earth

(Earth Focus: Episode 53) It is possible to rehabilitate large-scale damaged ecosystems, to improve the lives of people trapped in poverty and to sequester carbon naturally. John Liu presents "Hope in a Changing Climate," which showcases approaches that have worked on the Loess Plateau in China, Ethiopia and Rwanda. Produced in collaboration with the Environmental Education Media Project (EEMP).

Shades of Gray: Living with Wolves

Gray wolves once ranged across North America. But by the 1930s, they were nearly extinct — trapped, poisoned and hunted by ranchers, farmers, and government agents. With protection under the 1973 Endangered Species Act, the wolf population rebounded. But wolves lost federal protection in 2011. Now, with hunting permitted in many Western states, the future of this once endangered species may again be in question. Can we live with wolves? "Earth Focus" travels to Montana and Wyoming to find out.