How many vehicles were on the road in 1960? How many vehicles were on the road in 1980? How many vehicles were on the road in 2009?
I have no data. You have no data.
All I know is that China is starting up a new coal fired electric power plant every week of the year.
All I know is the number of vehicles on the road in China and India were miniscule in 1960 and are close to 1 billion today. That trend is repeated in South America, Southeast Asia, Russia and Former Soviet Block counries.
The FACT is there is massive increase in carbon dioxide and carbon monoxide in the air.
Whether or not that causes global warming or not, I have no clue. Whether or not that causes pollution of the air or not, I do know it does.