(From Blue Legacy's Expedition: Blue Planet)

Nearly two years after the TVA coal ash spill in Kingston, Tenn., many have already forgotten its impact on the community and the environment — yet the TVA spill is still the largest industrial spill in American history. It was six times larger in volume than the BP oil spill in the Gulf of Mexico.

In September 2010, Alexandra Cousteau and Expedition Blue Planet visited Kingston, Tenn., to find out exactly what the toll of "clean coal" is on water quality, water ecosystems and the communities that lie fractured by the pollution of their waterways. 

Alexandra Cousteau meets students
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In July 2010, Alexandra Cousteau and her international Expedition Blue Planet team departed on a 14,500-mile journey across North America to investigate global water issues "in the backyard" of one of the world’s leading economies. Living, working and exploring water stories together, Alexandra and her team will use everything from the underwater gear invented by her grandfather to the latest in satellite technology and live social media to bring the thrill of adventure and the wonders of nature to audiences across the globe.

Expedition Blue Planet bus

Clean coal? The price of water pollution
Video: Alexandra Cousteau revisits the TVA Kingston Coal Ash Spill, which was six times larger than the Gulf oil spill.