TEDxOilSpill - John Francis - We Must Stop Exploiting the Planet August 16, 2011

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In the early 1970s John Francis gave up using motorized vehicles after witnessing the devastating effects of an oil spill in San Francisco Bay. Soon afterwards he took an even more radical step: a vow of silence that lasted 17 years, during which he undertook a pilgrimage by foot across America on behalf of the environment and world peace, earning a Ph.D. in environmental studies along the way.

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