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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 Resonance Concept gives glimpse of next Murano

The Nissan Resonance Concept has bowed at the 2013 Detroit Auto Show, giving the world a glimpse at the company's future design direction for crossovers. Specifically, the concept heralds what the next-generation Murano may look like once it touches down. Nissan has already confirmed the successor to the big crossover's throne will be produced in Mississippi for the first time. With a "floating" roof and dynamic head lamp arrays, the Resonance boasts a far more athletic appearance than the snub-nosed current generation. Inside, designers worked up a cockpit aimed at conveying what "the future of first-class space travel might be."
Nissan isn't saying what the upcoming Murano will have under the hood, but the Resonance boasts an all-wheel-drive hybrid powertrain with a small-displacement internal combustion engine and an electric motor. A lithium-ion battery delivers power while a CVT takes care of putting power to the wheels. Take a look at the full press release below for more information.

Nissan's London Black Cab postponed because it can't meet emissions targets

Emissions concerns in London are causing headaches for Nissan, as the company continues its efforts to bring its Black Cab to the city's streets. A proposed ultra-low emissions zone could lead to standards in the city center that are so strict the gas-powered taxi can't meet them, AutoExpress reports. It's unclear just how low the new emissions standards may be, although AE references London's mayor, Boris Johnson, and his drive to make every London taxi emissions-free by 2018 as a particular thorn for the Japanese automaker. It's worth noting that the NV200 taxi is both cleaner and more fuel efficient than London's current fleet of iconic black cabs. That alone makes it seem like reason enough to get the new cabs on the streets. But it's the strictness of the proposed standards and the apparently set-in-stone nature of the NV200's current engineering that is holding up the cab's future. While Nissan offers an emissions-free e-NV200, it would reportedly need to completely reengineer the NV200-based cab to meet the future standards if they're approved. Whether that will happen, though, remains an open question.