Have Earth's vibrant waterways - its streams, rivers, estuaries and even oceans - become delivery systems for invisible poisons?

Originally released by National Geographic, 2004. Streaming video file encoded with permission for digital streaming by Infobase on April 07, 2015.

Unhealthy Waters (7:01); --Herbicides and Amphibian Populations (5:57); -- From Marshes to Rivers (4:18); -- Chemical Mixtures (3:20); -- Threat to Human Animals (6:50); -- Plants as Natural Allies Against Toxins (5:52); -- Toxic Farm Run-Off (6:54); -- Natural Solutions to Chemical Problems (3:09); -- Ocean Fish and Toxins from Land (7:35); .