Last summer, Greenfield cycled 4,700 miles across the US on a bamboo bicycle
during his Off the Grid Across America bike tour, and he's also gone a year without
showering, pedaled across Iowa with no bike seat for his Stand Up for Sustainability tour, and biked from NYC to Boston using only water from leaky faucets (Drip by Drip tour) to highlight water
conservation, so he's no stranger to putting it all on the line for what he believes in.