Fossil fuel companies think renewable natural gas is the answer to their PR problems. Environmentalists think not. Polly is a 10-year-old black-and-white Holstein cow, the oldest in a herd of about 300 on the Bar-Way Farm in Deerfield, Mass. Together they produce 2,000 gallons of milk each day. They also make enough poop to fill about two garbage trucks. The farm makes money off of both. In 2014, Bar-Way began working with ABC members Vanguard Renewables to install a biodigester, which uses specialized bacteria to convert organic material—for example, cow poop—into biogas, a versatile fuel. Once it’s purified, this biomethane, also known as renewable natural gas (RNG), is chemically identical to the main ingredient in the fossil-based natural gas that comes out of your stove or heats your water. More >>