"Earth Focus" speaks with Jeremy Monroe about his film "Willamette Futures," which documents the effort to restore the watersheds of Oregon's largest river system. Satirical writer George Wolfe's controversial act of civil disobedience, leading a kayaking expedition down the cemented Los Angeles River, is the focus of Thea Mercouffer's film "Rock the Boat." The expedition sought to have EPA declare the river navigable so that it could gain protection under the Clean Water Act. The boating trip down the L.A.

(Earth Focus: Episode 70) The cost of climate change is rising and its consequences are increasingly threatening our national security. Droughts, floods, wildfires, and severe weather cost lives and livelihoods when they damage property, crops, and infrastructure. Communities in Texas, Iowa, Colorado, Alaska are already struggling with the impact of climate change and coastal cities face expensive consequences within a couple of decades. The high price we are paying today is a harbinger of what the future may hold. How will the US economy and national security be affected?

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."

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.

This episode features author and illustrator Lynne Cherry's film series "Young Voices for the Planet" about young adults making positive environmental change.

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.