1. Short title This Act may be cited as the Adopt the Greenhouse gases, Regulated Emissions, and Energy use in Transportation model Act or the Adopt GREET Act . 2. Definition of Administrator In this Act, the term Administrator means the Administrator of the Environmental Protection Agency. 3. Lifecycle greenhouse gas emissions for approved fuel pathways (a) In general Subject to subsection (b), not later than 90 days after the date of enactment of this Act, and not later than every 5 years thereafter, the Administrator shall update the methodology used by the Environmental Protection Agency in lifecycle analyses with respect to greenhouse gas emissions that result from a fuel pathway to which a D code has been assigned pursuant to a petition described in section 80.1416 of title 40, Code of Federal Regulations (or successor regulations), that has been approved by the Administrator. (b) Requirements (1) First update In carrying out the first update required under subsection (a), the Administrator shall adopt the most recent Greenhouse gases, Regulated Emissions, and Energy use in Transportation model (commonly referred to as the GREET model ) developed by Argonne National Laboratory. (2) Subsequent updates In carrying out the second and each subsequent update required under subsection (a), the Administrator shall— (A) as necessary, adopt, review, or update a methodology determined to be appropriate by the Administrator