SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Adopt the Greenhouse 
gases, Regulated Emissions, and Energy use in Transpor-
tation model Act’’ or the ‘‘Adopt GREET Act’’. 
SEC. 2. DEFINITION OF ADMINISTRATOR. 
In this Act, the term ‘‘Administrator’’ means the Ad-
ministrator of the Environmental Protection Agency. 
SEC. 3. LIFECYCLE GREENHOUSE GAS EMISSIONS FOR AP-
PROVED 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 Adminis-
trator shall update the methodology used by the Environ-
mental Protection Agency in lifecycle analyses with respect 
to greenhouse gas emissions that result from a fuel path-
way 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 Adminis-
trator shall adopt the most recent Greenhouse gases, 
Regulated Emissions, and Energy use in Transpor-
tation model (commonly referred to as the ‘‘GREET 
model’’) developed by Argonne National Laboratory. 
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(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; or 
(B) adopt the methodology described in 
paragraph (1). 
(3) ESTABLISHMENT
OF
FUEL
PATHWAYS.— 
For any fuel pathway to which the Administrator as-
signs a D code pursuant to a petition described in 
section 80.1416 of title 40, Code of Federal Regula-
tions (or successor regulations), that is approved by 
the Administrator after the date of enactment of 
this Act, the Administrator shall, not later than 90 
days after the date on which the Administrator as-
signs that code, adopt the methodology described in 
paragraph (1) for purposes of modeling lifecycle 
analyses with respect to greenhouse gas emissions 
that result from that fuel pathway. 
(c) REPORT.—If the Administrator fails to carry out 
subsection (b)(2) before the applicable deadline described 
in subsection (a), the Administrator shall submit to the 
Committees on Agriculture, Nutrition, and Forestry, En-
ergy and Natural Resources, and Environment and Public 
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Works of the Senate and the Committees on Agriculture, 
Energy and Commerce, and Science, Space, and Tech-
nology of the House of Representatives a report describing 
the reasons for the failure to carry out subsection (b)(2), 
which may include a determination by the Administrator 
that the methodology adopted or updated in a previous 
update under subsection (a) remains the most current 
methodology based on available data, research, and tech-
nology. 
Æ 
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