mjs Wrote:
-------------------------------------------------------
> ok tards, electric vehicles still have lower a
> lower carbon foot print from birth to death.
>
>
http://www.greencarreports.com/news/1102307_once-a
> gain-electric-cars-have-lower-lifetime-carbon-emis
> sions
>
> Manufacturing-related emissions were found to be
> 15 percent higher for the Leaf, and 68 percent
> higher for the Model S.
>
> The largest single source of emissions in this
> area was battery manufacturing, which accounted
> for 24 percent of the Leaf's total, and 36 percent
> of the Tesla's total.
>
> But the electric car's "cradle-to-grave" carbon
> emissions remained much lower than those of
> gasoline cars.
>
> The Leaf had 51 percent lower emissions over an
> assumed lifetime of 179,000 miles than a
> comparable mid-size gasoline car, while the Model
> S had 53 percent lower emissions than a full-size
> car.
>
> That's because the battery-powered cars consumed
> far less energy while being driven--a benefit that
> becomes apparent almost immediately.
>
> The Leaf's extra manufacturing-related emissions
> were offset within 4,900 miles of driving, or
> about six months of ownership, assuming
> sales-weighted electricity emissions based on
> where electric cars are sold today.
>
> The Tesla's manufacturing-related emissions could
> be offset within 19,000 miles of driving, or about
> 16 months of ownership.
>
> Both figures could increase or decrease, depending
> on whether the cars are charged using clean
> renewable energy, or higher-carbon sources for
> their electricity.
Not necessarily. The study cited in your post has been contradicted by various others before and since. As your post glosses over in passing, it depends largely on assumptions for the source of power used to produce the electricity used during manufacturing and operation and how you account for it. Also, on what emissions (and other environmental effects) in particular are included. In fact, CO2 can be up to 80% greater over the lifetime where coal is the primary fuel burned to produce electricity. That's largely a result of basic conversion efficiency. While an electric motor is very efficient, generating the electricity to power it is not - only about 30% from ground to use vs about 85% from ground to use in the case of gasoline.
For a more recent attempt to model full life-cycle effects which disaggregates by stage and specific components including CO2 in particular, see page 19 here:
http://kimmoklemola.fi/data/documents/SF-comparison-USA-20160110.pdf
Over the full lifetime fuel cycle, the Tesla S results in higher CO2 vs a VW Passat fueled by any of clean diesel, waste-derived diesel, gasoline, or flex-fueled.
It also disputes Gerry's claim above regarding comparable effects resulting from materials and manufacturing. Again, the Tesla results in higher CO2 emissions in all of materials production (primarily battery-related), manufacturing, end-of-life, and power for operation:
Tesla S vs Passat (tons CO2e, note exponents)
Materials 1.01E+01 vs 4.01E+00
Manufacturing 3.92E+00 vs 2.77E+00
Maintenance 1.70E+00 vs 1.70E+00
End-of-Life 2.02E-01 vs 1.43E-01
Fuel/Electricity 4.86E+01 vs 9.24E+00
Tailpipe 00E+00 vs 3.81E+01