analysis reveals that modern diesel cars are actually better for the environment than battery ones.
pubs.acs.org/doi/full/10.1021/es903729a
The revelations come in a new report issued by Swiss government research lab EMPA, titled Contribution of Li-Ion Batteries to the Environmental Impact of Electric Vehicles. The Swiss boffins, having done some major research into the environmental burdens of making and disposing of li-ion batteries - to add to the established bodies of work on existing cars - say that battery manufacture and disposal aren't that big a deal. However, in today's world, with electricity often made by burning coal or gas, a battery car is still a noticeable eco burden:
The main finding of this study is that the impact of a Li-ion battery used in [a battery-powered car] for transport service is relatively small. In contrast, it is the operation phase that remains the dominant contributor to the environmental burden caused by transport service as long as the electricity for the [battery car] is not produced by renewable hydropower ...
A break even analysis shows that an [internal combustion engined vehicle] would need to consume less than 3.9 L/100km to cause lower [environmental impacts] than a [battery car] ... Consumptions in this range are achieved by some small and very efficient diesel [cars], for example, from Ford and Volkswagen.
Actually quite a lot of the new diesels are in the better-than-battery ballpark, according to UK government figures. The notional battery car considered by the EMPA analysts was a Volkswagen Golf with its normal drivetrain replaced by a battery one: but it seems that you would be doing slightly better for the environment to buy an ordinary new Golf with a 1.6 litre "BlueMotion" injected turbodiesel - which would be a lot cheaper. That would consume 3.8 l/100km, not 3.9.
So would a new Mini Cooper D hatchback or a new Ford Focus, actually. And if you could bear to go for something a little smaller - VW Polo rather than Golf - you'd be streets ahead on the environmental front, down as low as 3.4 l/100km with more than 15 per cent of the car's in-service emissions clipped off compared to the 3.9 l/100km battery-car baseline. As the Swiss boffins tell us, it's the in-service energy use and emissions which count most.
You could even treat yourself to a small estate car - the Skoda Fabia - and beat a battery Golf by a large margin in terms of eco-credentials, according to the EMPA analysis.
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