Stephen Rees's blog

Thoughts about the relationships between transport and the urban area it serves

Study: ‘It’s hard to beat gasoline’ on Air Quality

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I saw this on Planetizen and couldn’t resist the video

Now, we don’t have much ethanol around here, and the electricity we use is mostly  from existing hydro. So some of these results from the US don’t exactly translate here. So if you can afford a Tesla, go right ahead and don’t worry about those “electric cars are not so green” articles. The only time we use dirty, coal fired electricity is when our generating capacity is stretched at peak periods. Charge up your car overnight with a clear conscience.

The ethanol they refer to is E85 (85% of the fuel is ethanol): the most we use is 5 to 10%. At one time this was only true of so called premium fuels. Now it is not unusual to see ethanol in regular fuel and you may have to buy premium to avoid it. Most cars, of course, do not need premium fuel.

While hybrid cars do cut fuel consumption, this gets negated pretty quickly if you drive with a lead foot, or use a vehicle much bigger than you need. A smart car is going to use less gas than a giant SUV or truck, even if they are hybrids. And simple precautions like checking your tire pressures and not hauling a load of junk in your trunk will also cut your fuel consumption. Walking, cycling and transit (even if it is a diesel bus) are all better for the environment – and your own health.

Published on 15 Dec 2014

Life cycle air quality impacts of conventional and alternative light-duty transportation in the United States

Authors: Christopher W. Tessum, Jason D. Hill, and Julian D. Marshall

Published in the Proceedings of the National Academy of Sciences of the U.S.A.

Full text is openly available at: www.pnas.org/cgi/doi/10.1073/pnas.140685­3111

 

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