"John Francis (born 1946) is an American environmentalist nicknamed the planetwalker. Born in Philadelphia, the son of a West Indian immigrant, he moved to Marin County, California as a young man. After witnessing the devastation caused by a 1971 oil spill in San Francisco Bay, he stopped riding in motorized vehicles, a vow which lasted 22 years from 1972 until 1994. From 1973 until 1990, he also spent 17 years voluntarily silent. During this time he earned a Ph.D. in land management and traveled extensively, walking across the entire width of the lower 48 states of the USA as well as walking to South America."
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Learn more about John and his work at http://PlanetWalker.org