Meet Rob Greenfield, aspiring millionaire-turned radical environmental activist

Rob Greenfield is on a mission to bring a sustainable living message to the world using unusual approaches from wearing the trash he produces and foraging for food to cycling penniless across the US on a bamboo bicycle.

Rob Greenfield bounds over to a plant growing amidst the makeshift garden plots on the grounds of Berlin`s defunct Tempelhof Airport. He rips off a leaf and munches on it.

"It`s either a radish or a mustard. It`s in the brassica family. There are a lot of edible greens around," he says.

He`s looking for the edible dandelion he had spotted earlier but is sidetracked by some nettle, which you can eat raw without stinging your mouth if you fold it correctly. It`s good for you, he explains.

Read more - Can a minimalist mindset help save the planet?

Greenfield should know. He recently spent a year growing and foraging his own food, while living in a 100 square foot "tiny house" built from reclaimed materials in a backyard in Orlando, one of the fastest growing cities in the US...