I wonder how much the footprint for ICE changes based on where the crude was sourced from, eg: - traditional well in the US - fracking in the US - offshore

I wonder how much the footprint for ICE changes based on where the crude was sourced from, eg: - traditional well in the US - fracking in the US - offshore - Canadian tarsands Edit: This article has some interesting information on Energy Return on Investment (EROI) https://www.sciencedirect.com/science/article/pii/S0301421513003856 https://www.sciencedirect.com/science/article/pii/S030142151...