This 4.1 number seems kind of iffy in origin. They cite a document that cites the number from another document that cites the number from a fourth paywall-hidde

This 4.1 number seems kind of iffy in origin. They cite a document that cites the number from another document that cites the number from a fourth paywall-hidden document[1] that seems to be a case study of one car based on information provided by the maufacturer, where the transport is covered only in a side sentence. Also there's a graph that shows the transport being a tiny slice of the overall lifetime GHG footprint. A much better way would be to just take the weight and use widely available ghg per km-ton numbers. [1] https://sci-hub.st/https://doi.org/10.1021/acs.est.6b00830 https://sci-hub.st/https://doi.org/10.1021/acs.est.6b00830