Even IF Global warming were due to cars & factories etc... There isn't a hell of lot that will change overnight. You can't tell people to park their cars at home. Look at what is happening in China too --- with their new economy, people are buying up cars like crazy - who have never owned cars before.
There are simply too many people on this planet --- Waaaaaayyyy too many.
"If it keeps up, man will atrophy all his limbs but the push-button finger." Frank Lloyd Wright