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Correspondent Hedrick Smith traces the early history of the Clean Water Act and speaks with founding EPA Administrator Bill Ruckelshaus. 03:18
Hedrick Smith investigates the alarming rate of "fish kills" in the rivers surrounding the Chesapeake Bay and genetic mutations among marine life in the area. 03:53
For more on this story go to http://www.pbs.org/newshour/ 03:38
Correspondent Hedrick Smith examines the impact of large-scale factory farms, a major source of pollution to US waterways. 02:21
Employing the same skills he uses in his work at NASA, Evan Thomas, a volunteer working with Engineers Without Borders, designs water recovery and purification systems for use in the arid country of... 01:13