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Comment by brndnmtthws | Hacker News Reader

I suspect it'd be negligible. You still require a lot of energy for creating and disposing of the batteries, manufacturing the vehicles, and of course charging them. Most of that power (for the time being) comes from non-renewables[1]. I don't have data to back it up, but I suspect that the lifetime energy required to build a fully electric car is still greater than that of an efficient ICE car.

Furthermore, according to the EPA, 27% of greenhouse gas emissions are for transport[2], however there's no breakdown by things like airplanes vs trains vs cars.

IMO, if people really want to 'change the world', we need to shift away from automobiles, consumerism, plastics, and conspicuous consumption. Live close to work, ride a bicycle, stop buying McMansions.

[1]: https://www.eia.gov/energyexplained/?page=us_energy_home

[2]: https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...

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Although the carbon emissions caused by the manufacturing of an electric car is greater than those for a gasoline car, the amount of carbon emissions for the total lifecycle of an electric car are on average half those of a gasoline car [1, Figure ES-2]. This is calculated using the average U.S. grid emission data. In a country such as Norway, where 98% of our grid is powered by hydro, the greenhouse gas emissions during the operation of an electric car is 99% less than that of a 2014 gasoline-powered car [1, Table 1].

The great thing about electric vehicles is that it makes it possible to greatly reduce emissions as the grid is transformed towards a larger share of reusable energy.

Another great trend is autonomous driving, which will enable a reduction in the number of cars by having cars as a service at a lower price. Fewer cars will mean that cars can be built better and last longer, as they can be more expensive. As long as these cars are electric and powered by renewable energy, the potential to reduce emissions compared with the current situation should be large.

[1] http://www.ucsusa.org/sites/default/files/attach/2015/11/Cle...

IIRC the biggest contributor to the transportation's emission are freight ships that cross the oceans. I wonder how they will be solved.. Maybe going all-electric will help people transform their mindset to no-emissions production (since cars live with people, frieghts ships don't), so it could be that this is an important cultural shift.

Oceanic shipping is a big emitter of pollutants that cause acid rain, mostly because its limits on sulfur in fuel are incredibly lax compared to those for cars/trucks. It's not a big CO2 emitter relative to land transportation.

https://www.quora.com/Is-it-true-that-the-15-biggest-ships-i...

We have that breakdown in California statistics and 91% of transport is private cars. Trains, planes, trucks, and off-road equipment is tiny.

Even so, electric cars are still less efficient, so we'd be worse off. There's at least one[1] study (of the batteries for the Ford Focus) which found that they resulted in 39% more CO2 emissions than the ICE version.

[1]: http://pubs.acs.org/doi/abs/10.1021/acs.est.6b00830

That requires you to assume a certain mix of energy used to manufacture the thing.

It reflects the current reality. We're not going to replace everything with nuclear power anytime soon.

True. However, while it is possible to make any kind of car with 100% renewable embodied energy, it is quite impossible to operate an ICE car on renewable.

that study is problematic because while they look at the cradle to gate cost of the electric drivertrain including battery, comparing to the ICE car drivetrain, they don't look at all the cost of Petrol + all the unaccounted for externalities that go into it's extraction and delivery. A good comparison would include the cost of electricity extraction both for the ICE car and the electric and then do the comparison. As it stands, this study tells us that Electric cars are more 'expensive' than ICE cars.

I'm confused by what you've written here.

When you say they "left out the petrol", are you assuming that a better analysis would assume that the petrol is never made in the first place?

I mean, that might be the wish but we don't yet live in a world where the gas will stay in the ground if we don't use it to fuel one automobile at the margin.

I think their point was that it seems unfair to count up all the of the embodied energy of an electric car's batteries, but to only count the potential energy of the ICE car's fuel.

Child has it. The way this study is written, we're asked to compare more or less the carbon impact of an empty gas tank and the battery pack. That seems a bit unrealistic to me. yes the drivetrain is different and therefore more costly, but when it comes down to it, looking at the examples in the paper, the comparison is between the battery pack and an empty gas tank. That seems disingenuous to the broader point of carbon emissions for the entire life-cycle of the vehicles, which presumably would include use.

Which approach is "more realistic" depends on whether you are evaluating the decision between an electric car and a gas car at the margin, or not.

If it's you as a consumer buying the next car to be produced, then it is entirely appropriate to compare it that way, because your single purchase will not change the entire life cycle.

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