Why are british drivers persecuted so much when their carbon footprint is only a tiny fraction of China's?

i agree that's over the top, I'm in the states and your right there are more cars in most states then there are in the whole of Britain, i live in Arizona and i would say that just the older cars that are emissions exempt probably make up more pollution then your whole country, it doesn't seem fair at all but i guess if you think about it we are the ones, along with china and most other countries that are in the wrong not your government who is doing all it can to reduce emissions. one thing that i think the "green folks" are overlooking though is the fact that in past times when we used wood and coal fires to keep warm and cook with, even with many fewer people in the world we were polluting the air far more then we are now, technically (not taking into consideration pollution from the past) we are cleaner now then we ever have been, if the world were to just even have the emissions standards of the US which isn't so great at all we would still be slowly improving our air quality in comparison to the past. there being way over the top about it over there.