Study shows which vehicles pollute the least in every US county

In light of the diminishing focus on greenhouse gas reduction by the US government, consumers seeking environmentally friendly vehicles may find that compact cars with smaller batteries offer the most sustainable choice. This insight comes from an extensive study conducted by researchers at the University of Michigan, which evaluates the total carbon emissions throughout a vehicle's lifecycle. The research, published in the journal Environmental Science and Technology, employs a lifecycle assessment model crafted by Argonne National Laboratory. It takes into account various vehicle types and powertrain options, alongside geographic factors and usage patterns. The analysis includes a comparison between internal combustion engine vehicles, hybrids, and battery electric vehicles (BEVs) across different classes, such as compact and midsize sedans, SUVs, and pickup trucks. As expected, gas-powered pickup trucks rank as the highest emitters, with a lifecycle carbon output of approximately 486 grams of CO2 equivalent per mile. In stark contrast, a compact electric sedan with a 200-mile battery boasts a mere 81 grams of CO2e per mile, translating to only 17% of the emissions of its gas counterpart. Similarly, a short-range electric pickup truck shows significant promise, emitting just 25% of the carbon footprint of a traditional gas pickup. Interestingly, hybrid vehicles that do not require plugging in offer only a modest reduction in lifecycle emissions—between 11% and 13%—compared to conventional combustion engines. However, plug-in hybrids with a 35-mile electric range can achieve a 53% to 56% reduction in emissions, and those with a 50-mile range can increase this reduction to 56% to 60%, assuming they operate in electric mode for a substantial portion of their driving time. When it comes to battery electric vehicles, the findings are clear: smaller battery packs lead to lower environmental impacts. For instance, BEVs equipped with a 400-mile range exhibit lifecycle emissions that are 67% to 69% lower than their internal combustion engine counterparts. Furthermore, 300-mile BEVs reduce emissions by 81% to 83%, while a 200-mile BEV contributes only 25% to 26% of the CO2 emissions of an equivalent gasoline vehicle. This pivotal research not only highlights the environmental benefits of compact and electric vehicles but also provides consumers with the necessary tools to make informed decisions that contribute to a more sustainable future.