Oceans support life, yet they are overfished, polluted, and, with global climate change, are becoming increasingly acidic.

(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.

Los Angeles is one of the biggest biodiversity hotspots in the world, despite its smog, urban sprawl and snarling freeways. At least 20,000 native and non-native plant and animal species are thriving despite human interference, and in some cases because of it. How can people help make urban habitats more welcoming to non-human urban dwellers?

Led by Buddhist monks, Cambodia's indigenous Chong people protest the construction of a hydroelectric dam. The dam, to be built by the Chinese company Sinohydro, would displace the Chong and destroy their ancestral forest home. Kalyanne Mam documents their plight in her film "Fight For Areng Valley." China is beginning to draw on its religious traditions — Tibetan Buddhism, Daoism and Confucianism — to help address serious environmental challenges as profiled in Gary Marcuse and Shi Lihong's film "Searching for Sacred Mountain." 

(Earth Focus: Episode 45) The future -- Swedish style. Stockholm's Royal Seaport, a rundown district in Sweden's capital, is set to become a model of energy efficiency. Plantagon, a leader in vertical urban agriculture, has an answer to feeding the mega cities of tomorrow -- urban skyscraper farms. The Stockholm eatery Nyagatan, cuts carbon emissions by going local and organic. Solvatten, a Swedish water purification system that uses sunlight is now being used around the world.

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.

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.

“Vanishing Coral” presents the personal story of scientists and naturalists who are working with local communities to protect coral reefs that are being destroyed by warming seas, pollution, and destructive fishing practices. Featured in the documentary is the President of the Biosphere 2 Foundation Abigail Alling, marine biologist and coral expert Phil Dustan, captain of the Mir research sailing vessel Mark Van Thillo, and Nono Suparno, a leading conservationist in Bali.

(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.