Kayaker Ken Campbell has been paddling along the west coast in search of debris from the Japanese tsunami of March 2011.
Former Marine Corps Drill Sergeant Jerry Ensminger has been on 15-year crusade to convince the public that the tap water at the Marine Corps base Camp Lejeune caused his daughter's death from Leukemia.
Michael Brown, owner of a plastic company, has been looking for new recycling solutions, especially since he saw how plastics pollute the ocean.
We hear from Tim de Christopher, who is known as a monkey wrencher for disrupting a federal auction on oil leases. Contributor Alex Chadwick shares a journey with Tim along a Utah River
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