Wastes and Emissions
Methane is a greenhouse gas 25 times more potent than CO2. Methane is produced during the decomposition of wastes.
Livestock manure management is a major source of methane emissions in the United States, accounting for 10% of methane emissions in 2015. The majority of manure management methane emissions come from dairy farms.
In addition, Landfills, another feedstock of RNG, are the third largest source of methane emissions in the United States.
Methane capture and Life cycle Analysis
Unlike other transportation fuels, Lifecycle Analysis gives RNG credit for reducing GHG emissions in two ways:
Cleaner burning. With a methane content of 98%, RNG is identical to fossil natural gas. This means that just like CNG, RNG when used in transportation, is cleaner burning than diesel.
Methane capture. The process of turning waste products like cow manure into transportation fuel greatly reduces the amount of harmful methane that is released into the atmosphere.
For this reasons, RNG is recognized by the California Air Resources Board and the US Environmental Protection Agency as the cleanest transportation fuel pathway on the market. Dairy RNG has an even lower carbon footprint than renewable electricity!