Adopt GREET Act

HR 6152, the Adopt GREET Act, requires the Environmental Protection Agency (EPA) to adopt and use the GREET model - a scientific tool developed by Argonne National Laboratory - for calculating lifecycle greenhouse gas emissions of transportation fuels. The bill mandates the EPA update this methodology every five years, starting 90 days after enactment, and specifically requires the first update to use the GREET model. This directly affects the EPA in its regulatory work and fuel pathway developers seeking approval for new fuels under existing EPA rules. The law ensures EPA analyses of fuel emissions align with the most current scientific model, with reporting requirements if updates are delayed.