Do forget acid rain
Ozone depletion, acid rain, and erosion.
Hey, weren't we also facing global cooling?
Yep, Algore made the outrageous claim that the fir trees dying on top of Lookout Mountain in Tennessee was caused by acid rain when in truth the trees are infested with a parasitic bug of some sort.
BTW, the bugs are easily eradicated with pesticides but the terrain is so rough that the trees must be sprayed by helicopter.