After seeing a massive oil spill pollute San Francisco Bay in 1971, John Francis gave up all motorized transportation. For 22 years, he walked everywhere he went -- including treks across the entire United States and much of South America -- hoping to inspire others to drop out of the petroleum economy. Soon after he stopped riding in cars, Francis, the son of working-class, African-American parents in Philadelphia, also stopped speaking. For 17 years, he communicated only through improvised sign language, notes, and his ever-present banjo. Listen to the environmental pilgrim, John Francis, retell the story in his own words!