What’s cooler and more eco-friendly than riding a bike? Riding a cardboard bike. It doesn’t exist yet, but Phil Bridge, a Sheffield Hallam student, designed the cardboard set of two wheels that went on display this week. OK, so the whole thing isn’t made of cardboard, but the wheels and chain are the only elements that aren’t constructed of the light and bio-degradable material. Bridge calculates that it would cost about 15 pounds (that’s around $30) to construct the bike, making it not only a green mode of transportation, but a cheap one as well. But living in notoriously overcast Portland makes me wonder: what happens when it rains???

Watch the BBC’s video on it here.