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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.

Nissan Sentra, Buick LaCrosse to headline LA Auto Show

We're less than a month away from the start of the Los Angeles Auto Show, and automakers have been lining up their debuts for the upcoming left-coast expo. The latest announcement comes from the show's organizers who are eager to tout the global debuts slated for next month. Chief among them will be new versions of the Buick LaCrosse and Nissan Sentra. So far all we've seen of the 2017 LaCrosse is a glimpse at the front grille, but it's already promising to bring elements of the Avenir concept to the street. The original LaCrosse was launched in 2004 and was replaced in 2010 with the current model. The Sentra nameplate has been around much longer, but the current model was launched more recently in 2013. The new version spied recently while undergoing testing is promised to be a substantial update on that model, not a complete replacement, bringing it up to speed with the latest equipment and revised styling. This represents the first official confirmation we've received of when Nissan will be unveiling the new Sentra. Mitsubishi will also be on hand with its new Outlander Sport, as well as the redesigned Mirage. They'll be joined as well by new versions of a couple of high-end models that promise to resonate with the local crowds in tinseltown. Land Rover has chosen the LA show as a suitable venue to unveil the production Range Rover Evoque Convertible that will drop the top on one of the most stylish luxury crossovers on the market. And Porsche, as we know, is gearing up to hit the track with the new Cayman GT4 Clubsport - a customer racing version of the company's little two-seat, mid-engined sports car that's been lightly modified for motorsport competition. Of course these won't be the only new metal on display at the Californian auto expo. They'll be joined as well by the likes of the new Infiniti QX30, Hyundai Elantra, Kia Sportage, and Jaguar F-Pace - many of which we've already seen. Meanwhile companies like Fiat, Ford, Mazda, Mercedes, Subaru, Volvo, Volkswagen, and Elio Motors are keeping their plans under wraps for the time being. But with mere weeks to go, it won't be long before we see what they've got in store as well.

Chevy Volt sales drop in June, Nissan Leaf inches upwards

Different month, same story. That's the gist of the monthly US sales numbers from the Chevy Volt and the Nissan Leaf. These were the first two mass-market plug-in vehicles to go on sale in the US and we've been comparing their sales numbers for what seems like ages now. So far, the 2014 tale of the tape shows the all-electric once again trumping the plug-in hybrid. The last time the Volt outsold the Leaf was in October 2013. Chevrolet sold 1,777 Volts in June. That was good enough to be the Volt's best sales month of the year, but it's down 34 percent from the 2,698 units sold in June 2013. In fact, it's on par with the 1,760 Volts sold in June 2012. Given the steady sales, General Motors might need to push up the release of the next-gen Volt to gin up excitement, especially if it also offers some of the things that current Volt drivers say they want improved: more range, a lower price and a fifth seat. GM also said it sold 85 Spark EVs in June, an increase of 215 percent over June 2013 Nissan sold 2,347 Leafs last month. The good news continues for Nissan, which says it sold 2,347 Leafs last month. That's an increase of 5.5 percent over 2013 numbers and makes 2014 the best June ever for Leaf sales. Let's credit Texas. Toby Perry, Nissan's director of EV sales and marketing, said in a statement that, "Since the Texas state incentive went into effect in May, we've seen a big jump in Leaf sales in the Austin, Dallas and Houston markets. Our dealers are telling us that they saw more traffic in their stores, and they had their best Leaf sales performance in the last weekend in June." Even with that increase, Atlanta remains the top Leaf market. Nissan has sold 12,736 Leafs in the US so far this year; Chevy 8,615 Volts. Our detailed monthly sales write-up of green cars in the US, including plug-in vehicles, hybrids and diesel cars, is coming soon. For now, we invite you to discuss these numbers in the Comments. Related Gallery 2013 Nissan Leaf View 55 Photos News Source: GM, Nissan Green Chevrolet Nissan Electric Hybrid PHEV ev sales