The Environmental Protection Agency has quietly edited Scope 3 emissions out of its corporate climate toolkit. There was no press release or Federal Register notice. The navigation simply changed. For anyone who follows the car business, that matters more than it sounds, because for an automaker, Scope 3 is where almost all of the carbon lives.
What’s Gone and What’s Left
Start with what EPA’s own website shows today. The Center for Corporate Climate Leadership homepage, last updated September 8, lists “Scopes 1 and 2 Emissions Accounting” under Getting Started. Its Guidance section contains three items: Scope 1 and 2 inventory guidance, supply chain guidance, and management plan guidance. Scope 3 inventory guidance isn’t listed anywhere on the page.
The section that used to hold it has been renamed too. The hub page is now titled “Scopes 1 and 2 Emissions Inventorying and Guidance,” and its page metadata shows a last modification on December 4, 2025. EPA didn’t hide Scope 3 in a subfolder. It rewrote the table of contents so Scope 3 no longer has a chapter.
Related Articles
- The Chinese Car Ban Bill Also Outlaws Airbags Nobody Noticed
- Volkswagen’s Old Beetle Factory Is About to Build Iron Dome Parts. The Real Story Is Why It Had To.
There’s an irony here. EPA’s surviving Scope 1 guidance still shows a diagram credited to the GHG Protocol’s Corporate Value Chain (Scope 3) Standard. The agency kept the picture of the value chain and removed the instructions for measuring it.
For a record of what used to be there, EPA keeps official web snapshots of its site taken every four years on January 19. The 2021 snapshot defines Scope 3 as emissions from assets a company doesn’t own or control but influences through its value chain, and notes these emissions “often represent the majority of an organization’s total GHG emissions.”
Why Carmakers Should Care
The final version of the Scope 3 guidance page, last updated in May 2022, walked companies through all 15 GHG Protocol categories. It pointed them to EPA’s spend-based supply chain factors for purchased goods. For Category 11, “use of sold products,” it explained that no special factor was needed. Companies could apply EPA’s existing combustion and electricity factors to the energy their products would use over their lifetimes.
Swap EPA’s example product, electronics, for a pickup, and Category 11 becomes the lifetime fuel burned by every vehicle an automaker sold that year. A University of Michigan Center for Sustainable Systems project done with Ford found that value chain emissions account for more than 90 percent of an automaker’s greenhouse gas inventory, with use of sold products the dominant source. That’s why Ford’s science-based target calls for cutting use-phase Scope 3 emissions 50 percent per vehicle by 2035 from a 2019 baseline. The factory smokestack is a rounding error next to the tailpipe.
The Tools Are Aging in Place
Some of the underlying tools still exist, but nobody seems to be maintaining them. The Emission Factors Hub still offers downloads, and its newest edition is dated January 2025. It was an annual update, and there’s no 2026 edition listed. Oddly, the page still explains how to calculate a Scope 3 category using grid loss data, which suggests an editor missed a spot.
EPA’s spend-based supply chain factors, the numbers companies use to turn purchasing dollars into estimated emissions, are still in the federal data catalog. The v1.3 dataset covers 1,016 commodities, uses 2022 emissions data priced in 2022 dollars, and was last updated in July 2024.
That 2022-dollar detail is worth understanding. Spend-based accounting multiplies what you paid by a kilograms-of-CO2e-per-dollar factor. If a tariff raises the price of an aluminum coil by 25 percent, a spend-based inventory reports 25 percent more emissions from that purchase, even though the smelter burned the same energy. Frozen factors plus volatile metal prices produce inventories that track the purchasing budget, not the carbon. The fix is primary data from suppliers, which takes years to build.
Part of a Broader Federal Retreat
The page edits line up with bigger moves.
On May 29, the SEC proposed rescinding its 2024 climate disclosure rules entirely, arguing they exceed the agency’s statutory authority. That rule had already been stayed, and the Commission had voted in March 2025 to stop defending it in court.
EPA has also proposed ending reporting obligations for 46 source categories in its Greenhouse Gas Reporting Program, the facility-level database that underpins much of the country’s Scope 1 data. In a separate final rule, it pushed the 2025 reporting deadline to October 30, 2026 while it considers the rest.
For car people, the biggest change came in February, when EPA finalized its rescission of the 2009 endangerment finding, the legal basis for regulating greenhouse gases from new vehicles.
There’s history here, too. The 2021 snapshot shows EPA dropped out of the Climate Leadership Awards in 2018, canceling that year’s awards and its conference sponsorship. And the January 2025 snapshot of EPA’s homepage, taken the day before the inauguration, featured the 50th anniversary of the agency’s Automotive Trends report, touting record gains in fuel economy and CO2 emissions. That homepage also listed Climate Change in the main navigation. The current menu doesn’t.
California Didn’t Get the Memo
A missing federal web page doesn’t cancel anyone’s legal obligations. California’s SB 253 requires companies with more than $1 billion in revenue that do business in the state to disclose Scope 1 and 2 emissions starting in 2026 and Scope 3 starting in 2027, following the GHG Protocol. That describes every major automaker, most tier-one suppliers, and the big publicly traded dealer groups.
CARB’s July workshop materials show where the state is heading. CARB has proposed moving the first Scope 1 and 2 deadline to November 10, 2026. For Scope 3 in 2027, staff want five categories to be mandatory: purchased goods and services, fuel and energy-related activities, waste, business travel, and employee commuting. Category 11, use of sold products, would be voluntary.
That leads to an odd result for the auto industry. Under California’s proposal, an automaker’s single largest emissions source, the vehicles it sells, would be optional to report. Its supply chain purchases would be mandatory. Category 1 covers steel, aluminum, glass, and battery cells, which is exactly where spend-based factors and tariff-driven price swings distort the numbers. CARB would also require companies to disclose what percentage of each category’s emissions comes from primary supplier data, so leaning on stale federal averages will be visible to anyone reading the report. CARB even scheduled an August listening session specifically for manufacturers, including automotive.
Related Articles
- Third Time’s Not the Charm: Stellantis Just Re-Recalled 328,381 Jeep Grand Cherokees for the Same Spring That Keeps Falling Off
- Tesla’s Self-Steering Crash Save: The Rules Nobody Wrote Yet
The workshop deck includes one more notable line. CARB staff acknowledged uncertainty about how companies are preparing for mandatory reporting given the general rollback of federal support for climate initiatives. That’s about as close as a regulator comes to saying Washington left the room.
What It Means Beyond the Boardroom
Nothing on your window sticker changes. Fuel economy labels run through a separate regulatory process, and deleting a guidance page doesn’t touch them.
The effect shows up upstream. If you work for a parts supplier, expect more emissions questionnaires from your OEM customers, not fewer. With EPA no longer providing a common reference, each automaker will write its own supplier data requirements to satisfy California, European rules, and its own public targets. Suppliers that can document actual energy use per part will look better than those relying on dollar-based estimates, and that could eventually influence sourcing decisions.
For buyers, the market signal is subtler. With federal tailpipe greenhouse gas standards rescinded, one of the remaining pressures on powertrain mix comes from corporate emissions targets and state disclosure regimes. The pages EPA deleted were never binding law. They were free instructions for tallying the carbon in a value chain. Companies still have to do the math. Now they’ll just be using someone else’s instructions.