Regulations
CARB Proposed Modifications to the Low Carbon Fuel Standard
Background
On August 12th, 2024, the California Air Resources Board (CARB) posted the latest proposed amendments to the Low Carbon Fuel Standard (LCFS). These confirm some of the previous amendments proposed earlier this year, while introducing new ones. Here is a recap of some of the important proposed changes.

Lifecycle Analysis of U.S. Medium- and Heavy-Duty Vehicle Fuel Pathways
March 10, 2026
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A recent study published in Environmental Science & Technology evaluates the lifecycle energy use and greenhouse gas (GHG) emissions of medium- and heavy-duty vehicles (MHDVs) in the United States.

EPA Demands Manufacturer Data as It Expands Action on DEF System Failures
February 15, 2026
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A brief summary of recent EPA changes to DEF-related failures.

EPA repeals 2009 GHG endangerment finding
February 12, 2026
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The US EPA is repealing the 2009 GHG endangerment finding and terminating all vehicular GHG standards.