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American autos aren’t bigger because consumers have suddenly embraced off-roading, the construction trades, or home improvement projects. They’re bigger because automakers want to escape regulations. Each manufacturer is required to comply with boutique greenhouse gas emissions standards, which are calculated based on the size and capabilities of the cars in their fleets. Smaller cars are held to different standards than larger cars. So are those with specialty features like all-wheel drive or large towing capacities. By changing the makeup of their fleets, in other words, car companies can change the standards to which they’re held. Those greenhouse gas emissions targets are measured in grams of carbon dioxide or its greenhouse gas equivalent per mile.

As the EPA points out in its impact analysis, carmakers’ shift to larger vehicles has undermined the effectiveness of EPA regulations. The recent, rapid growth in car size, the agency writes, “has permitted compliance under higher numerical standards.” As a result of the increased average footprint of cars, automakers in 2021 could emit eight more grams per mile than in 2012. The EPA had projected the rules it implemented that year would result in average targets that were 22 grams per mile lower than those that were actually in place in 2021. And it therefore projected its 2012 rules would reduce carbon dioxide emissions by 3.5 percent per year from 2012 through 2021. Instead, the agency found it reduced emissions by about 2 percent per year.