In 2013, Greenfield cycled 4,700 miles (7,600 km) across America on a bicycle made of bamboo to inspire Americans to live more sustainably.

[9] On this 104-day ride he used 160 US gallons (610 L) of water, created two pounds (0.9 kg) of trash, traveled via his own power except for one mile (1.6 km) on a ferry into New York City, plugged into five electrical outlets, and never turned on a light switch.

[10] To raise awareness about water waste, he lived off a leaky fire hydrant for five days in New York City.

In the first half of the ride, he volunteered at nonprofits, planted wildflowers and vegetables along his path, and promoted a healthy and waste-free existence.

[16] He left home with $2,000 in cash, no credit cards, and upon arrival in Madison, Wisconsin, donated his last $421 to a non-profit.

Seeing a beautiful display of a couple thousand dollars' worth of perfectly good food pulled from dumpsters near them does the trick, though.

[19] The primary reason corporations have given for not donating their excess food is the fear of liability if someone gets sick from eating it.

The goal was to attempt to live by Robin’s philosophy that you can travel the world relying on just your ingenuity and the kindness of strangers.

[24] In 2017, Greenfield organized a cross-country bike ride in which the bikers performed good deeds along the way, such as planting fruit trees, volunteering in community gardens, and picking up trash.

[29] He has vowed to earn less than the federal poverty threshold each year, donates 100% of his media income to grassroots non-profits, and his financial net worth is kept to a bare minimum.