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I can't calculate transport infrastructure lifecycle carbon emissions
You don't really need to, because the market has already done it for you. Price is an excellent first order proxy for aggregate resource depletion, so the cheapest is usually the greenest. If you want to get into the weeds, you should probably adjust for market distorting taxes, subsidies and regulations, but ain't nobody got time for that.
I can't crew. I can't cycle to Southampton or Holyhead. I can't calculate transport infrastructure lifecycle carbon emissions. I'm pretty inadequate really.