You might be talking CO2 emissions where a car emits more than a bike. Pollution is a different matter though. Even the big 4-stroke tourers have worse emissio

You might be talking CO2 emissions where a car emits more than a bike. Pollution is a different matter though. Even the big 4-stroke tourers have worse emission control than cars; the 2-stroke motorbikes are exponentially worse in SOx/NOx/CO/particulate emissions (which hurt your lungs rather than the climate).