This is from memory from a while ago, so take it with a massive block of salt. Although motorcycles are a lot more fuel efficient than most other forms of transport, they don’t have to comply with the same kinds of emission standards and as a result have “nastier” emissions. Again from memory I thought that was primarily NOx, which I thought was more of an air quality thing than a greenhouse gas thing, but maybe there is something else as well?
This is from memory from a while ago, so take it with a massive block of salt. Although motorcycles are a lot more fuel efficient than most other forms of transport, they don’t have to comply with the same kinds of emission standards and as a result have “nastier” emissions. Again from memory I thought that was primarily NOx, which I thought was more of an air quality thing than a greenhouse gas thing, but maybe there is something else as well?