National Geographic: Human Footprint

ShareThisWith the aid of eye-opening visuals, this National Geographic special illustrates the true nature of the "footprints" human beings leave behind on the planet. By tracing the arc of an average person's life -- a time period that spans about 2.5 billion seconds -- the program reveals how much energy a person consumes, how much waste he or she produces and even how many people they will have met by the time they die.