Scope 3 emissions are the hardest to measure but often the largest share of a vehicle's total carbon footprint

Scope 3 emissions are the greenhouse gases produced when someone else uses or disposes of a vehicle you buy — not the emissions from making it or driving it yourself. They include fuel burned by the next owner, emissions from recycling the car at end of life, and even the energy used to transport it to the dealership. For most vehicles, Scope 3 dwarfs the other two categories combined, which is why it matters when you are deciding between a gas car, hybrid, or electric vehicle.

The reason Scope 3 is hard to pin down is that it depends entirely on what happens after you sell or scrap the car. A used gas sedan you buy today might be driven for another 100,000 miles by the next owner, or it might sit in a lot for years. An electric vehicle you purchase now will produce zero tailpipe emissions for its next owner, but the electricity grid powering it might get cleaner or dirtier over time. Manufacturers rarely publish Scope 3 numbers because they cannot control them — but understanding the concept helps you see why an EV's true environmental benefit grows the longer it stays on the road.

Key Takeaways

  • Scope 3 emissions come from using and disposing of a vehicle after you buy it, not from manufacturing or your own driving.
  • For most cars, Scope 3 represents 60 to 80 percent of lifetime emissions because future owners will drive the vehicle for years.
  • An electric vehicle produces lower Scope 3 emissions than a gas car because the next owner will burn no fuel, even if the electricity grid is not perfectly clean.
  • Scope 3 is unpredictable because it depends on how long the next owner keeps the car and what the power grid looks like in future years.
  • When comparing vehicles on environmental impact, focus on total lifetime emissions rather than manufacturing emissions alone.

How Scope 3 differs from Scope 1 and Scope 2 emissions

Scope 1 emissions come from burning fuel in the engine — the tailpipe emissions you see on an EPA label. Scope 2 emissions come from the electricity used to manufacture the vehicle at the factory. Scope 3 is everything else: the fuel burned by every owner after you, the energy to transport the car to dealers and auctions, the emissions from recycling steel and aluminum when the car is scrapped, and even the energy used to refine the gasoline that future owners will burn.

The three scopes stack on top of each other. A gas sedan might produce 5 tons of Scope 1 emissions over 150,000 miles of driving, 2 tons of Scope 2 emissions during manufacturing, and 15 tons of Scope 3 emissions from the next owner's driving and the car's eventual recycling. An electric vehicle might produce 0 tons of Scope 1 (no tailpipe), 8 tons of Scope 2 (more energy-intensive battery production), and 8 tons of Scope 3 (the next owner's electricity use, which is cleaner than burning gasoline). The EV's total is lower even though manufacturing emissions are higher.

Why Scope 3 is usually the largest piece of a vehicle's carbon footprint

A car spends most of its life being driven by someone other than the person who built it. The average vehicle in the United States is on the road for 12 to 15 years and travels 150,000 to 200,000 miles. If you buy a five-year-old car, the next owner might drive it for another 10 years. All of that driving produces emissions — and those emissions belong in Scope 3 because they happen after you purchase the vehicle.

Manufacturing a car is energy-intensive, but it happens once. Driving produces emissions every single day. A gas car that gets 25 miles per gallon will burn roughly 6,000 to 8,000 gallons of fuel over 150,000 miles, producing about 13 to 17 tons of carbon dioxide. That is Scope 1 — and it happens in the future, not at the factory. Scope 3 also includes the emissions from refining, transporting, and selling that fuel, which adds another 20 to 30 percent on top. For an electric vehicle, Scope 3 includes the electricity the next owner will use, but electricity is cleaner than gasoline in most parts of the United States, so the total is still lower.

How an electric vehicle reduces Scope 3 emissions compared to a gas car

An EV produces zero tailpipe emissions, so the next owner will not burn any fuel. That eliminates the single largest source of Scope 3 emissions. Instead, Scope 3 for an EV includes the electricity used to charge the battery, which varies by region and by year. In states like California and New York, where the grid is powered partly by wind and solar, an EV's Scope 3 emissions are roughly 40 to 50 percent lower than a comparable gas car. In states with more coal power, the difference is smaller but still meaningful — usually 20 to 30 percent lower.

The grid also gets cleaner over time. An EV you buy today will produce lower emissions in 2035 than it does now, because more renewable energy will be on the grid. A gas car's emissions stay the same no matter what year it is — the next owner will still burn gasoline. This is why an EV's environmental advantage grows the longer it stays on the road and the longer you own it. A used EV purchased today will be cleaner in 10 years than a used gas car purchased today, even if you never drive it yourself.

The role of battery recycling in Scope 3 emissions

When an EV reaches end of life, the battery must be recycled or repurposed. Recycling requires energy, which produces emissions — but the amount is small compared to the fuel savings over the vehicle's life. A typical EV battery recycling process produces roughly 0.5 to 1 ton of carbon dioxide equivalent. Over the same vehicle's lifetime, a gas car produces 13 to 17 tons from fuel alone. Even accounting for battery recycling, the EV's total Scope 3 is still lower.

Battery recycling also recovers valuable materials like lithium, cobalt, and nickel, which reduces the emissions from mining new materials for future batteries. This creates a secondary benefit: as more EVs are recycled, the emissions from manufacturing the next generation of batteries will fall. Scope 3 for an EV purchased in 2035 will be lower than Scope 3 for an EV purchased today, partly because recycled materials will require less energy to process.

What you cannot control about Scope 3 emissions

You cannot predict how long the next owner will keep the car, how many miles they will drive, or what the electricity grid will look like when they own it. You also cannot control whether the car will be recycled responsibly or abandoned in a lot. These uncertainties are why manufacturers do not publish Scope 3 numbers — the numbers depend on decisions made years in the future by people they will never meet.

This does not mean Scope 3 is irrelevant to your purchase decision. It means you should focus on the vehicle type rather than the specific model. Buying an EV instead of a gas car reduces Scope 3 emissions regardless of who owns it next, because no future owner will burn fuel. Buying a fuel-efficient gas car reduces Scope 3 compared to a gas-guzzler. Buying a used car instead of a new one reduces Scope 3 because the manufacturing emissions have already been produced — you are spreading them across more owners and more miles.

How to think about Scope 3 when comparing vehicles

When you are deciding between a gas car, hybrid, and electric vehicle, look at total lifetime emissions rather than manufacturing emissions alone. A study by the International Council on Clean Transportation found that an EV produces roughly 50 to 70 percent lower lifetime emissions than a comparable gas car in most regions of the United States, even accounting for battery manufacturing and electricity grid mix. That 50 to 70 percent difference is mostly Scope 3 — the fuel the next owner will not burn.

If you are buying used, the manufacturing emissions have already been paid. Your choice between a gas car and an EV affects only Scope 3 — the emissions from your own driving and the next owner's driving. An EV will produce lower Scope 3 over the rest of its life, which is why buying a used EV can be a lower-emission choice than buying a new gas car, even though the EV's manufacturing footprint was higher.

Frequently Asked Questions

Does Scope 3 include the emissions from driving the car myself?

No. Your own driving is Scope 1 (tailpipe emissions) and Scope 2 (electricity for charging, if you own an EV). Scope 3 includes only the emissions from future owners and from end-of-life recycling. This is why buying an EV reduces Scope 3 for the next owner — they will not burn fuel, even if you do not own the car anymore.

If I keep my car for 20 years, does that reduce Scope 3?

No. Scope 3 is defined by what happens after you sell or scrap the car, not by how long you own it. Keeping a car longer does reduce your personal carbon footprint per mile driven, because the manufacturing emissions are spread across more miles. But Scope 3 itself does not change — it depends on the next owner's choices.

Is an EV's Scope 3 lower in every state?

Yes, but the difference varies. In states with cleaner grids (California, New York, Washington), an EV's Scope 3 is 40 to 50 percent lower than a gas car. In states with more coal power (West Virginia, Wyoming), the difference is smaller — usually 20 to 30 percent lower. Even in the dirtiest grid regions, an EV still produces lower Scope 3 emissions than a gas car.

Should I buy a used EV or a new gas car to minimize Scope 3?

A used EV is usually the lower-emission choice. The manufacturing emissions for the EV have already been produced, so you are only responsible for Scope 3 — the electricity the car will use for the rest of its life. A new gas car has lower manufacturing emissions but higher Scope 3 because future owners will burn fuel for years.