That’s an interesting question which is answered in the following TED talk that explores the efficiency of different modes of transport in an amusing way. What is required to move a human from point A to point B on foot, bike, car, train? Bike Engineer Zach Krapfl looks at the environmental footprint of many methods of modern transportation and finds some surprising answers to this question, along with big opportunities for change. A most promising one: People who have changed their main mode of transportation to electric bikes are living healthier, happier, more eco-friendly lives.