You got two things here. 1. the fact that AGW is happening because humans are dumping massive amounts of CO2 into the atmosphere thereby causing the average global temperature to rise. and 2. which is what impact this rise in average global temperatures will have on the climate.
Number 1 is clear because of atmospheric physics, which establishes that the atmosphere gets warmer as the level of CO2 rises. Number 2 is based on models which are complex and still evolving. The bottom line is that Number 1 is going to cause significant changes to climate. Hurricanes, thunderstorms, droughts, floods, permafrost line, date of last frost, etc.




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