CO2 Carbon emissions estimate

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I know it's a big undertaking but it would be great if you could generate a carbon estimate for trips. You could determine the electrical provider for a lot of stations and use that to give a more precise estimate of carbon based on the efficiency of the electricity provider, then if you cannot determine the provider, fall back to the national or regional average CO2 electric emissions by kWH. Eg the US is like 0.512kg CO2e/kWh