Op-Ed: I keep seeing articles about energy harvesting, which is the concept of generating electricity from life's daily movements. The latest reference is in this Associated Press story  about environmentally friendly nightclubs -- a non-profit group called Enviu is working on a dance floor that captures energy from the vibrations . It's very expensive right now, but what if an entire factory floor included such technology? What if all the computers in New York, London, and Tokyo captured a little bit of energy each time human fingers touched a keyboard's keys and a mouse's buttons? Those would be elegant ways to recycle the energy sitting right in front of us. Here's a Google search link  if you want to learn more.