You just don't hear the phrase "alternative fuels" as much as you did, say, 10 years ago. With a couple of million plug-in electric cars now on the world's roads, the idea of swapping in one hydrocarbon fuel for another may have passed its time. Admittedly biodiesel continues to make quiet inroads for diesel commercial vehicles. DON'T MISS: When... Which alternative fuels will survive long-term? Take our Twitter poll
You just don't hear the phrase "alternative fuels" as much as you did, say, 10 years ago. With a couple of million plug-in electric cars now on the world's roads, the idea of swapping in one hydrocarbon fuel for another may have passed its time. Admittedly biodiesel continues to make quiet inroads for diesel commercial vehicles. DON'T MISS: When... 
Let's say you buy the greenest car you can, one that uses a different kind of fuel, and drive it happily for several years. What happens when the supply of your fuel suddenly ends, and you can no longer fill up your car? That's just what happened to Duncan Chalmers of Seattle, who can no longer conveniently get natural gas to fill up his 2008... ![2017 Audi A5 Sportback g-tron (European model), driven, Aug 2017 [photo: Ronan Glon]](http://images.hgmsites.net/tmb/2017-audi-a5-sportback-g-tron-european-model-driven-aug-2017-photo-ronan-glon_100618902_t.gif)
Audi’s vision of future mobility primarily centers around an array of long-range electric cars scheduled to debut in the coming years under the "e-tron" badge. These are intended to be Tesla killers, as they’re often called in Germany. But there’s another kind of tron with a “made in Germany” label as well, and... 
Natural gas vehicles were first promoted starting in about 2000 as a way to reduce reliance on imported oil and cut tailpipe emissions. Their promise appeared to grow near the height of the global financial crisis, when gas prices hovered around $4 per gallon across much of the United States. The domestic fuel promised to cut carbon-dioxide... 
The industrial revolution that began around 1750 was powered in large part by coal, and the carbon-rich fuel had 200 good years after that. By the middle of the last century, however, serious studies had begun of its deleterious effects on human health—and that was before the climate-change impact of human emissions of carbon dioxide became... 
Over the past century, gasoline-powered vehicles have gotten simultaneously more complex and more reliable. Service intervals have lengthened, drivers no longer check a car's fluids daily or weekly, and many new-car owners will never once open the hood. Reliability data shows that some of them won't visit a dealer service department except for... 
The "war on coal" has long been a talking point of politicians running for elected office in the state of Kentucky. The state was once home to a booming coal industry that has floundered over the years as cheaper fracked natural gas has supplanted coal for electricity generation. The state's coal industry job losses have thus been due to the surge... 
Natural gas is growing as a part of the world's grid mix, because its carbon per kilowatt-hour is much lower. But methane leaks that emit large volumes of climate-change gas into the air may offset that advantage. Now, a Google Street View car has allowed researchers to pinpoint and quantify the severity of natural-gas leaks in five different... 
While renewable energy gets significant press as an alternative to coal in electricity generation, it isn't the main factor in decreasing the use of that carbon-intensive fuel. Thanks to its generally lower cost, natural gas is quickly displacing other fuels in the nation's power plants. In addition to its cost benefit for electric utilities... 
Natural gas has not proven popular for vehicles bought by individual consumers, but some fleet operators continue to find it an attractive alternative to gasoline and diesel. That's because the lack of public fueling infrastructure proves a major drawback for natural-gas passenger cars, but fleets can circumvent that by operating their own...