How do hybrid cars reduce carbon emissions (wouldn't they just transfer fuel emissions to electricity consumption?) is probably the furthest we've strayed into the mechanical engineering aspects of climate change mitigation, and that seemed worth a discussion about site scope.

Where is our scope boundary here?


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(This is just the first flash of ideas I have on that. A discussion should probably follow, and I'm 100% open to it.)

In my opinion, it is off-topic, since it is not in scope of any earth scientists to be able to discuss the CO2 trace of combustion vs hybrid vs purely electrical cars.

We can discuss how much the emissions from car traffic influence the climate, but for such question to be relevant on this site, the question itself should IMHO contain the relevant data, i.e., what is the CO2 trace.

Such question could be asked on:

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    $\begingroup$ Yes definitely off topic! imho $\endgroup$
    – winwaed
    Commented Oct 27, 2014 at 13:07
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    $\begingroup$ I agree that it's off topic here, as I can't think of any field that would describe itself as "earth science" that would answer it. I feel that it would be on-topic, and probably get a good answer, on sustainability.SE. $\endgroup$ Commented Oct 27, 2014 at 14:04
  • $\begingroup$ Many users may not dislike this question, because environmental protection techniques are quite popular among earth scientists. But it is off topic. The only site, which I can imagine for this question, is area51.stackexchange.com/proposals/60453/engineering. $\endgroup$
    – BHF
    Commented Oct 27, 2014 at 22:16

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