> We should really ban big diesel rigs from areas with population density above a certain threshold. I'd go much further than that. I'd ban all combustion engi

> We should really ban big diesel rigs from areas with population density above a certain threshold. I'd go much further than that. I'd ban all combustion engines in cities. There are enough alternatives: Walking, bicycles, ebikes, trams, electric buses, trains, and electric cars. We should try to keep the air as clean as possible in densely populated areas.