instead of bad faith and hostility, maybe you could try to have a productive discussion. the US economic sector emitting the most greenhouse gas is transportation. and 83% of transportation emissions are from cars and trucks. that second link goes on to show that using cars and trucks for personal transport and freight are the worst for CO2 emissions, except air freight (much worse than truck freight). but air travel emits less CO2 per passenger-mile compared to personal vehicles. there are many reasons China emits a lot less CO2 per capital than the US but one of them is the widespread use of mass transit