Yard and food waste could be turned into methane, the principle component in natural gas, says a power company working to do just that. "Harvest Power is currently in the process of building two large anaerobic digestion facilities, one in Richmond, outside Vancouver, Canada and the other in London, Ontario. There it plans to take food and yard waste and turn them into methane, which can be sold as a fuel. Harvest Power also operates large composting facilities in California and the northeastern U.S. In Tullytown, Penn., it runs Waste Management’s Warner North Composting Facility."