According to Steven Guilbeault, former environment minister under Justin Trudeau and former member of Prime Minister Carney’s cabinet, “Switching to an electric vehicle is one of the most impactful things Canadians can do to help fight climate change.”
And the Carney government has only paused Trudeau’s electric vehicle (EV) sales mandate to conduct a “review” of the policy, despite industry pressure to scrap the policy altogether.
So clearly, according to policymakers in Ottawa, EVs are essentially “zero emission” and thus good for environment.
But is that true?
Clearly, EVs have some environmental advantages over traditional gasoline-powered vehicles. Unlike cars with engines that directly burn fossil fuels, EVs do not produce tailpipe emissions of pollutants such as nitrogen dioxide and carbon monoxide, and do not release greenhouse gases (GHGs) such as carbon dioxide. These benefits are real. But when you consider the entire lifecycle of an EV, the picture becomes much more complicated.
Unlike traditional gasoline-powered vehicles, battery-powered EVs and plug-in hybrids generate most of their GHG emissions before the vehicles roll off the assembly line. Compared with conventional gas-powered cars, EVs typically require more fossil fuel energy to manufacture, largely because to produce EV batteries, producers require a variety of mined materials including cobalt, graphite, lithium, manganese and nickel, which all take lots of energy to extract and process. Once these raw materials are mined, processed and transported across often vast distances to manufacturing sites, they must be assembled into battery packs. Consequently, the manufacturing process of an EV—from the initial mining of materials to final assembly—produces twice the quantity of GHGs (on average) as the manufacturing process for a comparable gas-powered car.
Once an EV is on the road, its carbon footprint depends on how the electricity used to charge its battery is generated. According to a report from the Canada Energy Regulator (the federal agency responsible for overseeing oil, gas and electric utilities), in British Columbia, Manitoba, Quebec and Ontario, electricity is largely produced from low- or even zero-carbon sources such as hydro, so EVs in these provinces have a low level of “indirect” emissions.
However, in other provinces—particularly Alberta, Saskatchewan and Nova Scotia—electricity generation is more heavily reliant on fossil fuels such as coal and natural gas, so EVs produce much higher indirect emissions. And according to research from the University of Toronto, in coal-dependent U.S. states such as West Virginia, an EV can emit about 6 per cent more GHG emissions over its entire lifetime—from initial mining, manufacturing and charging to eventual disposal—than a gas-powered vehicle of the same size. This means that in regions with especially coal-dependent energy grids, EVs could impose more climate costs than benefits. Put simply, for an EV to help meaningfully reduce emissions while on the road, its electricity must come from low-carbon
electricity sources—something that does not happen in certain areas of Canada and the United States.
Finally, even after an EV is off the road, it continues to produce emissions, mainly because of the battery. EV batteries contain components that are energy-intensive to extract, but also notoriously challenging to recycle. While EV battery recycling technologies are still emerging, approximately 5 per cent of lithium-ion batteries, which are commonly used in EVs, are actually recycled worldwide. This means that most new EVs feature batteries with no recycled components—further weakening the environmental benefit of EVs.
So what’s the final analysis? The technology continues to evolve and therefore, the calculations will continue to change. But right now, while electric vehicles clearly help reduce tailpipe emissions, they’re not necessarily “zero emission” vehicles. And after you consider the full lifecycle—manufacturing, charging, scrapping—a more accurate picture of their environmental impact comes into view.
Annika Segelhorst and Elmira Aliakbari are policy analysts at the Fraser Institute.
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