by Cat DiStasio, Engadget
Think: Las Vegas streetlights powered by footsteps
When it comes to discussions about renewable energy, solar and wind power often take center stage. To a lesser degree, other forms like geothermal energy and hydro-power also get some attention. But many people may not be aware that there are many other sources of renewable energy currently in use around the world, all helping to counterbalance the enormous carbon dioxide emissions from burning fossil fuels. Small projects are turning to dirt and microbes, underground stores of liquid magma and even pedestrian footsteps to harvest energy that would otherwise be wasted. While none of these efforts alone can save the planet, the continued research and development to increase their efficacy may eventually help entire communities eschew fossil fuels without sacrificing much-needed electricity for light, safety, warmth and medical care.