Electric Vehicles

It's broadly understood that electric vehicles are more environmentally friendly than their counterparts that burn only gasoline. And yes -- that includes the impact of manufacturing batteries and generating power to charge them. But even then, such generalizations gloss over specifics, like which EVs are especially eco-friendly, not to mention where. The efficiency of an electric car varies greatly depending on ambient temperature, which is less compromising for gas-burning vehicles.

We now have the data and math to answer these questions, courtesy of the University of Michigan. Last week, researchers there released a study along with a calculator that allows users to compare the lifetime difference in greenhouse gas emissions of various vehicle types and powertrains from "cradle to grave," as they say. That includes vehicle production and disposal, as well as use-phase emissions from "driving and upstream fuel production and/or electricity generation," per the university itself.

What's more, these calculations can be skewed by where you live. So, if I punch in my location of Bucks County, Pennsylvania, I can see that my generic, pure-ICE "compact sedan" emits 309 grams of carbon dioxide equivalent (gCO2e) per mile. A compact hybrid would emit 20% less; a plug-in hybrid, 44% less; and an EV with a 200-mile range, a whopping 63% less. And, if I moved to Phoenix, the gains would be even larger by switching to pure electric, to the tune of a 79% reduced carbon impact.