Natural gas-powered vehicles are already in existence, most notably powering city buses for low-emission public transportation.
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Three rivals won a contest to build low-emission, 100-mpg cars that could be mass-produced.
Washington state has been another bright spot, powered by Boeing and other manufacturers attracted to its low-cost, low-emission hydropower.
The German carmakers in particular, with their huge research-and-development budgets, are dabbling in all manner of different low-emission vehicles.
While diamond lane access ended for solo drivers of low-emission vehicles, it continues for solo drivers of ultra-low-emission vehicles.
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Powered by a low-emission engine it can accommodate two crew and six passengers.
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Its products have been improving rapidly and it has the technological resources to be a leader in low-emission powertrains.
But it believes automobile companies will have to integrate themselves into a transportation system for a high-population, low-emission future.
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Ever since, carmakers have been placing their low-emission bets more on plug-in hybrids, clean diesels or pure electric vehicles.
The Democrats are fielding Heidi Heitkamp, a cheery former state attorney-general who now helps run a low-emission coal-fired power plant.
The United States did less than 2 percent of this advanced battery manufacturing that's going to be the key to these high-mileage, low-emission cars.
And the fact that the region will likely be producing the majority of the most low-mileage and low-emission cars certainly cannot hurt their future prospects.
In other green transportation news, a team from MIT is working on developing ionic wind thrusters that would serve as an energy-efficient, low-emission alternative to jet engines.
On Wednesday he announced his vision to see the world's first "Ultra Low Emission Zone", meaning by 2020 only zero or low-emission cars would be allowed into central London.
Andrews worries that the proposal will get watered down, as did the next phase of the low-emission zone to cut nitrogen dioxide emissions (it will only apply to city buses).
City Hall said the mayor recognised that more work was required and believes his proposal would act as a challenge for vehicle manufacturers to ensure more affordable and low-emission technologies were in place.
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Started in 1990, the program requires carmakers to earn a certain number of credits, based on their market share, from selling low-emission and no-emission vehicles, or face penalties that can include being barred from selling in California.
"Mr Fisker's departure is not expected to impact the company's pursuit of strategic partnerships and financing to support Fisker Automotive's continued progress as a pioneer of low-emission hybrid electric powertrain technology, " the company said in a statement.
Its lead in hybrid technology is under threat as other big carmakers scramble to bring low- and zero-emission vehicles to market before low-carbon legislation bites.
The low emission zone - which begins in February 2008 - aims to deter the most polluting vehicles from being driven in central London by imposing charges on lorries, coaches and buses that fail to meet low emission standards.
But that could quickly change, thanks to improvements in emission control and America's recent switch to low-sulphur diesel.
Some governments, including France's and Britain's, are so convinced of the benefits of green investment that they think the commission's near-term goal of a 20% emission reduction by 2020 is too low.
Increasing LIHEAP subsidies could raise the overall cost of achieving any given level of emission reductions, because it would somewhat offset the price signals necessary to motivate households to undertake low-cost reductions.
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