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.