that dreaded ozone again, ozone in the lower atmosphere is actually a greenhouse gas? so this is bad. in the upper atmosphere it keeps out the uv rays so this is good. but if the upper atmosphere ozone hole closes to much it traps greenhouse gases, this is bad. omg! i am getting a headache.
I gave up trying to understand their logic a long time ago. The whole "it's getting hotter so the whole planet is going to freeze in a new ice age" revelation left me with a migraine so I just leave it to the guys at South Park to explain it to me.
http://youtube.com/watch?v=GFjWjAz49Z4