meteorology (mt--rl-j) n. Abbr. meteor., meteorol., met. The science that deals with the phenomena of the atmosphere, especially weather and weather conditions.

climatology (klm-tl-j) n. The meteorological study of climates and their phenomena.

You can't have the second without the first, and neither are anywhere close to an exact science. Get a clue. Theory is all you have and to date no one has come close to proving that man is a significant cause of GW.