For this reason, it is imperative that we gradually move away from petroleum and make more use of wind power or other alternative energy resources. (innovations-report.com)
Increasing pollution and decreasing fossil energy resources encourage scientists to look for new clean and sustainable alternative energy resources. (rdmag.com)
Via Gas2 More on Landfills as Energy Sources: First Commercial - Scale Cellulosic Ethanol Plant Approved for California Landfill Gas to Energy: A Growing Alternative Energy Resource Greener Flying? (treehugger.com)