In the existing world of mounting energy prices, population growth, and concerns regarding greenhouse-gas emissions, the need for alternative energy and alternatives to landfi lls and livestock waste lagoons has to increase. Further, bioethanol producers have begun to face the irk of their “environmentally friendly” products relying too heavily on fossil fuels for their production, and they are now using biogas from landfi lls or feedlots to power their refi neries-biogas power for biofuels.