"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.

After centuries of over-harvesting and bouts of disease, oyster populations in the Chesapeake Bay plummeted along with profits for the oyster industry and the health of the Bay. In some areas, native oysters are becoming more abundant. But culture and ecology clash as watermen, who depend on harvesting oysters for income, are at odds with scientists and conservationists who want to restore oyster populations. Filmmaker Sandy Cannon-Brown looks at oysters and the people behind them in her documentary "Spat! Bringing Oysters Back to the Bay."

An impoverished former mining community in Colorado hopes that a proposed uranium mill will bring jobs and prosperity until environmentalists step in to try to stop it. Who gets to decide? Filmmaker Suzan Beraza documents the debate in her new film Uranium Drive In.

(Earth Focus: Episode 52) U.S. domestic gas production is on the rise because of hydraulic fracturing, or fracking, a controversial method of extracting natural gas from shale rock by pumping millions of gallons of water mixed with sand and chemicals underground at high pressure. Environmentalists say this gas boon threatens water supplies and pollutes air. Now, as fracking expands around the world, so does growing resistance. "Earth Focus" looks at three countries on the new fracking frontline: South Africa, Poland, and the UK.

There are tens of thousands of chemicals in our air, water, and in the everyday products we use. They are largely unregulated and few are adequately tested for safety. They contribute to disease and are linked to conditions such as asthma, autism, ADHD, diabetes, cancers, infertility, cognitive disorders, obesity, reproductive disorders and birth defects. "Earth Focus" looks at endocrine disruptors, ubiquitous chemicals that affect development, metabolism, fertility and intelligence at extremely low doses and at what measures could be taken to better ensure public safety.

(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).

Honey bees, the essential pollinators of many major U.S. crops, have been dying off in massive numbers since 2006. This threatens the American agricultural system and the one in 12 jobs that depends on it. There is growing evidence that a new class of pesticides -- nerve toxins called neonicotinoids, which are used on many U.S. crops like corn -- may be toxic to bees.

(Earth Focus: Episode 48): With a changing climate, a growing population and anticipated fresh water shortages, our food production must evolve. In this episode of Earth Focus, a look at innovative research that is helping develop new and improved root systems for agriculture in stressed conditions, a new Swedish model for urban agriculture, the use of solar energy to power food production in the Himalayas, and an innovative truck farm in New York City.

Asian elephants, already endangered in Indonesia and Thailand,are threatened further by human encroachment and illegal trade. In Indonesia, just 2,500 Sumatran elephants remain. As their last great forest habitat is being logged to make way for palm oil plantations, elephants are pushed into conflict with local people. In Thailand and Myanmar, an illegal and brutal trade in wild baby elephants is contributing to declining elephant populations.

Whether they are researching the pace of Alaskan glacier melt or measuring the impact of Arctic sea ice changes on our our weather, climate scientists go to some of the most remote areas on Earth to help us understand our environment. The Juneau Icefield Research Program (JIRP) brings scientists and students together annually to study glaciers. Jeff Barbee reports on the 2013 JIRP expedition. Julienne Stroeve of the National Snow and Ice Data Center looks at the impact changes in Arctic sea ice may have on weather patterns.

(Earth Focus: Episode 39) Two iconic American rivers are under threat. The Colorado River, a lifeline for the expanding population of seven US and two Mexican states, faces an increasing demand for water for drinking, sanitation, agriculture, and energy generation. Yet the Colorado already runs dry before reaching its natural end at the Gulf of California. Jamie Redford and Mark Decena discuss their new film Watershed: Exploring a New Water Ethic for the New West, which explores sustainable solutions to help address this pressing problem.

"Ground Operations," a new film by Dulanie Ellis and Raymond Singer, shows how farming provides both employment and therapeutic recovery for America's combat veterans. Then, meet organic pioneers from Minnesota and Maryland. Also in this episode, a segment showing how California's Pie Ranch develops an innovative way to bring healthy food to a high tech giant while saving a small family business in the process.