Modern diesel engines with SCR technology are amazingly clean running. The source of the hydrocarbons they consume is a much more relevant issue, and renewable fuels are available. Zero emission heavy transport is not scalable currently even if the technology exists. Of course I’m not saying society shouldn’t try to make things better in the genre, but these mandates are likely more about lining corporate pockets than actually making our air better. #diesel #renewables #globalwarming