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This map reveals the cleanest vehicles based on location

Naysayers love to point out how dirty the electricity grid mix is when it comes to charging electric vehicles. Curmudgeons are eager to jump into any conversation about EVs to enlighten the lucky listeners about how plug-in cars contribute to pollution, sometimes even throwing in a dash of climate-change denial for good measure. (Thanks, buddy. Pray, tell me more about the plight of oppressed SUV owners.) Unless someone buys an EV just because they think they're cool (which, yeah, they often are), they probably have at least a passable understanding of their environmental pros and cons. As many EV owners are already aware, location has a lot to do with any particular plug-in car's carbon footprint. Still, there's always more to know, and knowledge is not a bad thing, especially if one uses it to do the right thing. That's why this handy-dandy map from Carnegie Mellon University is so interesting. CMU researchers have compiled information about the lifecycle greenhouse gas emissions of various EVs based on where they're charged, as compared to gasoline-powered vehicles. The researchers looked at the Nissan Leaf, Chevrolet Volt, and Prius Plug-In Hybrid versus the gasoline-dependent Toyota Prius hybrid and the stop-start-equipped Mazda3 with i-ELOOP and compared grams of CO2 emitted per mile. CMU takes into account the grid mix, ambient temperature, and driving patterns. CMU takes into account the grid mix based on county, as well as ambient temperature and driving patterns in terms of miles traveled on the highway or in the city. For instance, if you drive a Nissan Leaf in urban areas of California, Texas, or Florida, your carbon footprint is lower than it would be if you were driving a standard Toyota Prius. However, if you charge your Leaf in the Midwest or the South, for the most part, you've got a larger carbon footprint than the Prius. If you live in the rural Midwest, you'd probably even be better off driving a Mazda3. Throughout the country, the Chevrolet Volt has a larger carbon footprint than the Toyota Prius, but a smaller one than the Mazda3 in a lot of urban counties in the US. The Prius and Prius Plug-In are relatively equal across the US. Having trouble keeping it straight? That's not surprising. The comparisons between plug-in and gasoline vehicles are much more nuanced than the loudest voices usually let on.

Meet the mother-daughter team that's worked on almost every Chevy Volt

It's Mother's Day, and we're soft enough we love our mothers enough to share a new video from General Motors with you. In it, we meet Monique Watson (left) and Evetta Osbourne, a mother-daughter team that works at the Detroit-Hamtramck Assembly where GM makes the Chevy Volt (along with all of GM's other plug-in hybrids: the Opel Ampera, Holden Volt and Cadillac ELR). The two work side-by-side and have installed the lithium-ion battery pack on almost all of those vehicles - nearly 80,000 of them - since GM started making the pre-production Volts in 2009. In a prepared statement, Watson said that she likes working next to her mom, day in and day out, and they the two are totally in sync when it comes to putting the 400-pound, 16.5-kWh packs into the vehicle undersides. They two can also share stories throughout the day, and Watson said, "The arrangement has absolutely improved our relationship." Osborne started working at Detroit-Hamtramck in 1999, Watson since 2006. If you're driving a Volt today, you probably have them to thank for doing a bit of the work putting your car together. See a short video of them in action below. It's Always Mother's Day for Detroit-Hamtramck Duo Mother, daughter install lithium-ion battery pack in nearly all GM electric vehicles 2014-05-08 DETROIT – For Detroit resident Evetta Osborne, every day is Mother's Day. That's because she literally works side by side with her daughter, Monique Watson, at General Motors' Detroit-Hamtramck assembly plant. They have installed the lithium-ion battery pack on nearly every Chevrolet Volt, Opel Ampera, Holden Volt, and Cadillac ELR since production began. In fact, apart from vacation days and an occasional sick day, the mother-daughter duo has installed almost every battery pack since the Volt was in pre-production in 2009. The ELR launched earlier this year. All told – including Ampera – that's more than 80,000 electric vehicles. "We're a good team and our relationship is secondary when it comes to performing our jobs – but it's great to work alongside my daughter, said Osborne, a mother of five. Because the battery packs weigh more than 400 pounds each, automatic guided vehicles – robotic carts that use sensors to follow a path through the plant – deliver them just as the vehicle body structures glide into position overhead. The carts then lift the T-shaped packs, and Osborne and Watson guide them into the chassis and secure each one with 24 fasteners.

Europeans ask Chevy to bring Volt back to Europe

A group of French fans is asking for a jolt of support from General Motors to get the 2016 Chevrolet Volt across the pond. The Association Amperistes et Amis des Vehicules Rechargeables is running a Change.org petition that currently has 383 signatures out of a goal of 500. While the attempt is admirable, it's probably going to take a lot more than several hundred people for the model to make a return to the continent after the poor showing of the Opel Ampera – first-gen Volt's European cousin. The group's major argument for bringing a version of the second-gen Volt to Europe is that consumers need "an intermediate choice between expensive or range-limited pure electric cars and plug-in hybrids with a miserable electric range." Furthermore, such a vehicle would prod the competition to produce similarly efficient electrified models. They also lavish praise on the abilities of the Ampera for its long EV driving range. The supporters aren't entirely kind to GM in the petition, though, and claim the company excluded the original car from marketing efforts there. The Ampera actually enjoyed a strong European launch with more orders than initially expected and briefly topped the best-sellers list among EVs there. It was even named 2012 European Car of the Year. Those halcyon days didn't last long, and by 2014 sales fell off to a trickle. The waning reception caused GM's decision not to introduce a version of the new 2016 Volt there or in Australia. Related Video: