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Hi Glen, to me the main point of difference is that with one, you may burn fossil fuel for propulsion, while with the other you must. That difference is very real. Also, you can choose to purchase home electricity from a renewable source (over here at least), so that charging from the grid doesn't necessarily result in the same CO2 emissions as using power from coal-fired plants. What is more debatable though is how well a given vehicle matches its owners' transport needs - in real terms, how much transport capacity beyond what is actually needed one is willing to purchase and maintain, using money that could otherwise be spent on astronomy.
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