Drivers in the U.S. have longer commutes than those in Europe and Asia, on average. In the U.K., short commutes in vehicles with combustion engines—whether gasoline or diesel—pose particularly tough emission problems. That's because the exhaust aftertreatment systems have to warm up fully before they cut emissions to the levels... Combustion engines: high emissions from short commutes a huge challenge
Drivers in the U.S. have longer commutes than those in Europe and Asia, on average. In the U.K., short commutes in vehicles with combustion engines—whether gasoline or diesel—pose particularly tough emission problems. That's because the exhaust aftertreatment systems have to warm up fully before they cut emissions to the levels... 
A global push to reduce vehicle emissions and create cleaner air for future generations has been underway for half a century now. However, while many governments around the world have introduced lower emission and higher fuel-efficiency standards for passenger cars, another large contributor to global emissions has mostly traveled under the radar... 
To most North Americans, the idea of banning all vehicles with internal-combustion engines seems unthinkable. Filling up with gasoline (or diesel) is as American as are dispersed low-density suburbs without mass transit, bike paths, or even sidewalks. Europeans, more of whom live in cities and most of whom have access to a more balanced set of... 
The Trump Administration has had a challenging start on numerous fronts, but its work to slash emission rules and eliminate regulations continues. The EPA administrator, climate-science denier Scott Pruitt, has said he isn't "currently" planning to target target California's ability to set its own emission rules. In March, the agency previously... 
Diesel-powered vehicles are facing a tough road ahead as more European cities move to ban older, dirtier, oil-burning cars. Diesel has long been the preferred fuel of European drivers thanks to its efficiency and lower carbon dioxide levels. However, mounting research has shown diesel-powered cars spew harmful toxins that may cause cancer and... 
Sometime between March 1 and 7, a specific page vanished from the website of the U.S. Environmental Protection Agency. Amidst coverage of the removal of the word "science" from the mission statement of the EPA's Science and Technology Office, it went largely unnoticed. First posted in December 2008, and modified several times over the next eight... ![Electric-car wells-to-wheels emission equivalencies in MPG, May 2017 [Union of Concerned Scientists]](http://images.hgmsites.net/tmb/electric-car-wells-to-wheels-emission-equivalencies-in-mpg-may-2017-union-of-concerned-scientists_100608699_t.gif)
Electric cars have no tailpipe emissions when running. But unless they're charged entirely on renewable energy—still statistically unlikely today—there are emissions associated with generating the electricity used to charge their batteries. For several years now, rigorous "wells-to-wheels" analyses of the carbon-dioxide emissions... ![Electric cars dominate U.S. climate-friendly vehicles [data: U.S. EIA; map: Climate Central]](http://images.hgmsites.net/tmb/electric-cars-dominate-u-s-climate-friendly-vehicles-data-u-s-eia-map-climate-central_100608171_t.gif)
The question is a reasonable one: electric cars may be zero-emission, but what about the electricity to recharge them? While renewable energy is growing globally, burning fossil fuels is still the source of most electric power today. The good news is that in most areas of the U.S., the "wells to wheels" carbon-dioxide emissions associated with... 
The Volkswagen diesel scandal left lasting imprints on the entire automotive industry, and may have changed the way regulators look at vehicles using the fuel forever. That's true not just in the United States, but elsewhere as well. The European Union is now increasing its efforts to make sure a scandal like Volkswagen's can never happen again... 
During President Donald J. Trump's half-hour meeting with Pope Francis at the Vatican yesterday, the pope gave the president a copy of his 2015 encyclical calling for urgent, drastic cuts in fossil-fuel emissions. It is unclear whether the U.S. president will peruse the document. Back at home, however, his administration is continuing unabated in...