If you couldn't guess from his wooden clogs, Pieter Hoff is from Holland, a country built on green energy and democratic desire, largely below sea-level. He's now using mother nature's example to regenerate tree in areas thought to be unsalvageable—like stripmines—with his innovative Groasis waterboxx, the small green pot on the left. Photo 8 of 9 in Pop!Tech Conference by Chelsea Holden Baker

Pop!Tech Conference

8 of 9

If you couldn't guess from his wooden clogs, Pieter Hoff is from Holland, a country built on green energy and democratic desire, largely below sea-level. He's now using mother nature's example to regenerate tree in areas thought to be unsalvageable—like stripmines—with his innovative Groasis waterboxx, the small green pot on the left.