Adopt GREET Act

This bill requires the Environmental Protection Agency (EPA) to use the Argonne National Laboratory's GREET model for calculating lifecycle greenhouse gas emissions from transportation fuels. Specifically, the EPA must adopt this model within 90 days of the bill's enactment and update its methodology every five years, using GREET for the first update and allowing flexibility for future updates. It directly affects fuel producers seeking EPA approval for new fuel pathways, as the EPA must apply the GREET model when assigning D codes (approval identifiers) to those pathways. The bill also mandates a report to Congress if the EPA misses update deadlines, explaining the delay.