California Air Resources Board

• December 2024 Enforcement Notice (posted 12/5/24)
• FAQs Regarding California Climate Disclosure Requirements (updated 11/17/25)
• Climate Related Financial Risk Report Checklist (updated 11/17/25)
• Preliminary List of Reporting/Covered Entities (posted 9/24/25)
  • To help validate the information in CARB’s preliminary list of entities, CARB is seeking stakeholder feedback through a voluntary survey tool. Entities that believe they may be subject to these requirements, or may qualify for an exemption, are encouraged to complete the survey, available here.
  • Each potentially-regulated entity remains responsible for compliance with statutory requirements, regardless of whether it was included in staff’s preliminary list or outreach.
• Draft Scope 1 and 2 GHG Reporting Template (posted 10/10/25)
  • CARB solicited public comment on a draft reporting template for Scope 1 and Scope 2 greenhouse gas (GHG) emissions, and a memo containing guidance on using the template under the Corporate Greenhouse Gas Reporting Program. View public feedback received here. 
• Enforcement Advisory, Climate-Related Financial Risk Reporting (posted 12/1/25)
• Climate-Related Financial Risk Reports (SB 261) Docket (posted 12/1/25)
• CARB Bill Implementation and Rulemaking Process

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Previous Life Cycle Analysis Models

CA-GREET3.0 Model and Tier 1 Simplified Carbon Intensity Calculators

The amendments to the LCFS regulation the Board adopted at its September 2018 hearing replace CA-GREET2.0 with the CA-GREET3.0 model and Tier 1 Simplified CI Calculators for LCFS fuel life cycle analysis. The CA-GREET3.0 model is used to generate the carbon intensities (CIs) of all fuel pathways, including Lookup Table pathways and applicant-specific Tier 1 and Tier 2 pathways.

Effective January 4, 2019 (released August 13, 2018*)

• CA-GREET3. 0 Model
• Tier 1 Simplified CI Calculator for Starch and Fiber Ethanol
  • Instruction Manual
• Tier 1 Simplified CI Calculator for Sugarcane-derived Ethanol
  • Instruction Manual
• Tier 1 Simplified CI Calculator for Biodiesel and Renewable Diesel
  • Instruction Manual
• Tier 1 Simplified CI Calculator for LNG and L-CNG from North American Natural Gas
  • Instruction Manual
• Tier 1 Simplified CI Calculator for Biomethane from North American Landfills
  • Instruction Manual
• Tier 1 Simplified CI Calculator for Biomethane from Anaerobic Digestion of Wastewater Sludge
  • Instruction Manual
• Tier 1 Simplified CI Calculator for Biomethane from Anaerobic Digestion of Organic Waste
  • Instruction Manual
• Tier 1 Simplified CI Calculator for Biomethane from Anaerobic Digestion of Dairy and Swine Manure
  • Instruction Manual

*Minor changes to models posted on August 13, 2018 are documented in the second LCFS errata.

CA-GREET3.0 Supplemental Document and Tables of Changes. The CA-GREET3.0 model was developed from GREET1 2016 developed at Argonne National Laboratory. Argonne’s currently supported GREET versions are available. The changes staff made in converting GREET1 2016 into CA-GREET3.0 are documented in this document.

Lookup Table Pathways (Table 7-1)

CA-GREET3.0 Lookup Table Technical Support Documentation. Describes the calculations, assumptions, and conditions for using the Lookup Table pathways developed by CARB using CA-GREET3.0. The CI of Lookup Table pathways for California Average Grid Electricity used in Transportation and the Smart Charging/Smart Electrolysis pathways are subject to annual updates, pursuant to section 95488.5(d). For the 2019 CIs of these electricity pathways, visit LCFS Pathway Certified Carbon Intensities and technical documentation.

Temporary Pathways Table (Table 8)

Temporary pathways certified pursuant to section 95488.9(b)(4) of the LCFS regulation:

• Biomethane CNG, LNG or L-CNG from Anaerobic Digestion of Swine Manure
• Renewable Propane
• Alternative Jet Fuel
• Renewable Naphtha

September 29, 2015 release (in use from January 2016 to December 2018): 

• CA-GREET 2.0 Tier 1
• CA-GREET 2.0 Tier 2
• CA-GREET 2.0 Supplemental Document
• California Reformulated Gasoline and Ethanol Denaturant Calculator.
• Oil Production Greenhouse Gas Emissions Estimator, or OPGEE

2009

• December 2009: California-GREET Model version 1.8b (modified by Life Cycle Associates LLC)
• February 2009: California-GREET Model version 1.8b (modified by Life Cycle Associates LLC)
• December 2008: California-GREET Model version 1.8b (modified by Life Cycle Associates LLC)
• September 2008: California-GREET Model version 1.8b (modified by Life Cycle Associates LLC)
• February 14, 2008: California-GREET Model 1.7 version 98
• Original GREET Model version 1.8b from ARGONNE National Laboratory 

The table below lists all archived E85 Ethanol meetings & workshops. Current meetings can be found at Alternative Fuels Meetings & Workshops.