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

The popular demand for avocados, once considered an “exotic” item, is having a devastating impact on a drought-stricken community in Chile. Lying within one of the largest avocado producing regions in the country, Petorca avocado plantations are in a battle over water rights, where claims of illegal water diversion are creating civil unrest.

(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.

Populations are dramatically shifting as climate change drives migration. Droughts and floods are driving many people away from their rural, farming communities into big cities. We see how this is manifesting in Mongolia and examine the factors leading to the new community of Haitian people living in limbo at the border between Mexico and the U.S.

(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.

Food and social justice. Human rights abuses, rape and corrupt practices in the Bangladesh shrimp industry. A report by the Swedish Society for Nature Conservation uncovers the human and environmental cost of shrimp farming and shows why buying shrimp from Bangladesh where they are exposed to pesticides and injected with dirty water may be hazardous to your health. UK's The Ecologist investigates the plight of African migrant workers in Italy and looks how financial speculation is threatening the livelihood of Mexican farmers.

Wood is found in countless products consumers use every day. In fact, lumber is closely connected to the world’s economy – a country’ s importation of lumber tends to rise in correlation with its gross domestic product. Following groups like “Guardians of the Forest,” we explore illegal lumber poaching in the forests of Brazil and Oregon, where citizens and scientists are working together to combat the illegal lumber trade.

Two cities, San Francisco and Freetown, brace for climate change using vastly different methodologies. San Francisco's developers are building expensive real estate on floodplains as officials try to heed expert projections on future sea levels. On the other side of the world, a deadly mudslide caused by torrential rains and deforestation in Sierra Leone shows the consequences of city planning that doesn't take climate change into account.

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.

Thousands of dolphins are killed solely for shark bait each year off the coast of Peru. An upsurge in shark meat consumption in Peru and the rise in the cost of fish bait has helped drive the hunt to as many as 10,000 dolphins killed each year according to some estimates. Jim Wickens documents this illegal practice in an original undercover investigation for "Earth Focus."

The realities of milk production are forcing dairy communities across the globe to rethink the dairy production process. In this episode, we travel to a village in Kenya where the commercialization of camel milk is proving a sustainable solution in the face of drought. In Northern California, the heart of the U.S. dairy industry is finding innovative alternatives to limit the use of water and manure emissions.

Anticipating future water needs, two regions on opposite sides of the world turn to technology for answers. Western Morocco, near the Sahara Desert, is currently facing unprecedented drought and groundwater mismanagement. But an ancient method of gathering moisture from fog is being taught to 13 villages, allowing people to have a level of local control over their most basic need. In Central Valley, California, the food basket of the world uses nearly 80 percent of the entire state's water supply.

The global demand for oil and gas has long-lasting impacts on the communities that supply it. In Alaska’s Arctic National Wildlife Refuge, powerful native communities are at odds over an oil exploration and drilling plan that will boost their economy but have long-term consequences on native species and their environment. In California’s Kern County, the mayors of two neighboring towns face off on the economic benefits and health risks of oil production and their vastly different visions for the most sustainable path to the future.

Every twenty minutes an elephant is killed to feed an insatiable demand for ivory. African elephants may be gone in as little as ten years. Behind the slaughter are the most dangerous groups in the world – organized crime syndicates, insurgents and terrorists. Ivory buys guns and ammunition for Uganda's Lord’s Resistance Army and Sudan's Janjaweed, both linked to mass atrocities and supports al Shabaab, the al Qaeda affiliate behind the attacks on Kenya’s Westgate Mall and Garissa University.

Solar power is changing lives in unexpected places. At the Barefoot College in Zanzibar, Muslim women who have traditionally been marginalized in the workforce are learning solar installation and bringing it back to their villages, which are primarily powered by candles and paraffin lamps. In East Los Angeles, formerly incarcerated individuals are finding green job opportunities as they transition underserved communities into solar power.

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.

The ocean is a sponge for all the greenhouse gas emissions we produce, and entire aquatic ecosystems are beginning to collapse. Off the coast of California, the disappearing abalone population is raising flags about ocean health and the lasting impact of rising sea temperatures, acidification and pollution. Various teams of scientists, volunteers and businesspeople are collaborating to protect underwater species threatened by the invasion of sea urchins.