I've never subscribed to man being able to affect earth's climate. Mt. St. Helens put more CO2 into the atmosphere, in one day, than man has ever produced. One major Volcano eruption will do far more than we will ever do. I live on the ring of fire, and I am expecting a major earth changing event. A Krackatoia, or Katmai, and we will again have years with no summers. Lots of people will die, mankind will be brought to their knees.