I do not think discussions about transportation environmental cost usually sufficiently consider the productivity lost because of how long it takes to get place

I do not think discussions about transportation environmental cost usually sufficiently consider the productivity lost because of how long it takes to get places by public transport. We get a number of hours of productive work from each person every day, and so that productivity required all of the resources that the person consumed in a day. An extra hour of commuting every day, because I need to go from A to B, but because I take public transport I need to go A to C and then C to B and along the way need to make lots of stops, means that an extra fraction of the resources I consumed for that day will not be used for productivity. Also, the diagrams showing public transport being more space efficient often seem to assume that the public transport will be at capacity. On my 30 minute bus ride, to/from a major downtown, I am not infrequently the only passenger on the whole bus.