What does this man care - he is flying back and forth from Washington DC to Florida weekly? 

You know during 911, and the airspace was shut down over N.America? The pollution levels cleared up a bit and a scientist tracked the average temperature increase +1C in three days. Everyone should read this link and learn about global dimming:

http://www.bbc.co.uk/sn/tvradio/programmes/horizon/dimming_trans.shtml