Are electric vehicles better for the environment than gas-powered vehicles?

Electric vs. gas — I'll pull the latest data on lifecycle emissions, batteries, and grid impact to compare them.

Yes, in almost all cases studied electric vehicles (EVs) are better for the environment than comparable gas-powered vehicles when measured over their full lifecycle, although they are not zero-impact.

Why EVs are generally cleaner

> Electric vehicles (EVs) have no tailpipe emissions

Generating the electricity to charge them may create carbon pollution, with the amount varying widely based on how local power is generated, but:

> Electric vehicles (EVs) typically have a smaller carbon footprint than gasoline cars, even when accounting for the electricity used for charging

> The greenhouse gas emissions associated with an electric vehicle over its lifetime are typically lower than those from an average gasoline-powered vehicle, even when accounting for manufacturing

That finding is consistent across major lifecycle analyses (LCAs) from the US EPA, Department of Energy's GREET model, Argonne National Laboratory, and the International Council on Clean Transportation (ICCT).

Efficiency also strongly favors EVs:

> EVs use approximately 87%–91% of the energy from the battery and regenerative braking to propel the vehicle. Gasoline vehicles only convert about 16–25% of the energy from gasoline into movement

Going electric also moves emissions out of cities:

> going electric also means taking emissions out of cities, improving local air quality. Even if charging an EV still results in emissions, they are usually produced farther from where many people live

How much lower are lifecycle emissions?

Lifecycle emissions include extracting materials, manufacturing and assembly, battery production, fuel/electricity production, operation, maintenance and end-of-life. Estimates vary by vehicle size, battery chemistry, lifetime mileage, and especially the electricity grid:

•Lifecycle emissions from electric vehicles are typically 30–70% lower than those of gasoline cars, depending on how clean the electricity grid is

•One analysis using the GREET Life Cycle Assessment Model found that EVs have 46% lower lifecycle emissions, while the ICCT found EVs sold in Europe had 73% lower lifetime emissions compared to combustion cars

•In a global ICCT review, the lifetime emissions of an average medium-size electric car were lower compared with a gasoline-powered car by 66%-69% in Europe, 60%-68% in the United States, 37%-45% in China, and 19%-34% in India

Independent energy research from Rystad Energy reached a similar conclusion:

> battery-powered vehicles contribute at most half the carbon dioxide equivalent (CO2e) of diesel or gasoline cars across their lifecycle, regardless of the country of operation. Even in countries where the power grid is dominated by fossil fuels, battery-powered cars emit less CO2e than internal combustion engine (ICE) cars over their lifecycle

Example country results from that study, which assumed an 18-year vehicle life and country-specific electricity forecasts:

•Under the base case scenario for power generation in China, the lifecycle emissions of a BEV are about 39 tonnes of CO2e versus almost 85 tonnes for an ICE vehicle

•A BEV emits 42 tonnes of CO2e across its life in the US, 58% lower than a gasoline or diesel vehicle that emits more than 100 tonnes

•Performing the same comparison for a coal-heavy power mix, in the case of India, results in 43% lower lifecycle emissions

The study also notes that whereas ICE vehicles become more emissions heavy as they age, BEVs will emit less over the years as power generation becomes greener, and emissions related to the operation of BEVs could drop by 86% as renewable sources replace coal and gas-fired generation.

Why EVs are not zero-impact - important caveats

> Some studies have shown that making a typical EV can create more carbon pollution than making a gasoline car. This is because of the additional energy required to manufacture an EV's battery

In fact:

> EVs are not zero-impact. Manufacturing produces substantial emissions (50-70% more than petrol cars)

•Battery production is resource-intensive. Producing the batteries requires large quantities of lithium, cobalt, and rare earth metals, and manufacturing of electric vehicles consumed 50% more water than traditional internal combustion engines

•Lithium mining can consume vast amounts of water — over 500,000 gallons per metric ton of lithium extracted. Another estimate notes mining 1 ton of lithium, enough for around 125 EVs, requires some 2 million liters of water

•Mining for lithium, cobalt, nickel, graphite and manganese is energy intensive and often involves shipping materials long distances before assembly, with links to habitat destruction, water depletion, soil and water pollution, and supply-chain ethical issues.

•The production process itself is energy-intensive and can produce significant emissions, and recycling batteries is difficult and dangerous, though research is ongoing to improve it.

•Heavier EV weight can also increase tyre wear and particulate emissions from non-exhaust sources.

The climate advantage of EVs therefore is smallest where electricity is most coal-dependent, and largest where the grid is powered by renewables or nuclear — for example France, largely dominated by nuclear power, has about an 84% lower carbon intensity than Germany, so emissions from charging there are about 70% lower.

> Still, over the lifetime of the vehicle, total GHG emissions associated with manufacturing, charging, and driving an EV are typically lower than the total GHGs associated with a gasoline car. That's because EVs have zero tailpipe emissions and are typically responsible for significantly fewer GHGs during operation

Researchers have found that while EV manufacturing creates 40-80% more emissions upfront, this deficit is typically recovered within 1.5-2 years of typical driving.

Bottom line

•For greenhouse gas emissions and local air quality, EVs are decisively better than gas cars over their lifetime in nearly all regions and grids studied today, typically by about one-third to two-thirds depending on grid and vehicle type.

•For resource use, water consumption, mining impacts and battery end-of-life, EVs have higher upfront environmental costs than gas cars.

•The benefits grow over time as grids get cleaner and as battery recycling and manufacturing become more efficient. When EVs are powered by and manufactured using clean electricity and use recycled battery components, they result in up to 90 percent fewer emissions over their lifetimes compared to gas cars

If you drive an EV charged from a relatively clean grid and keep it for many years, the environmental benefit over a gasoline car is large. If the grid is very carbon-intensive and the vehicle is driven very little, the benefit is smaller but still positive in most lifecycle analyses.

Citations (2)

1epa.govGovernment
Electric Vehicle Myths | US EPA
Backs: “Yes, in almost all cases studied electric vehicles (EVs) are better for the environment than comparable gas-powered vehicles when measured over their full lifecycle, although they are not zero-impact.”
2rystadenergy.comNot yet classified
Driving energy transition, EVs are better for environment
Backs: “battery-powered vehicles contribute at most half the carbon dioxide equivalent (CO2e) of diesel or gasoline cars across their lifecycle, regardless of the country of operation. Even in countries where the power grid is dominated by fossil fuels, battery-powered cars emit less CO2e than internal combustion engine (ICE)…”