Okay, so this isn’t quite there yet. I visited Bristol Robotics Laboratory and saw really impressive work in robots that can eat dead houseflies to power themselves. Today, these are slow robots, generating very small currents. But the science behind how fuel cells can be powered with biomass is progressing gradually. The press picked up on this with a recent article, Latest Robots Eat and Poop to Power Up on MSNBC. Some are worrying about the ecology or cultural impact of this- which is really years away yet. Here is a pickup by Cyberpunk.