Microorganisms in sewage treatment plants not only clean the sewage, they can also generate electricity. This requires a fuel cell in which the organic constituents of the waste water are decomposed by microbes. From the chemical energy content of waste ...

The Clean Energy Project, one of the largest branch networks for renewable energy, cleantech and sustainability, questioned over 1,000 of its members to their estimates regarding the impact of biofuels on the environment and society. Here is presented high information ...