Couple of corrections
Lightning Joe,
I appreciate your posts and generally agree with them but I have to correct a couple of things you said in this one.
First, as far as the CO2 level, it's accurate that at no time during human occupation of the Earth (about 2.5 million years) has CO2 in the atmosphere been this high but it probably was this high sometime between 15 and 20 million years ago and in the very distant past (about 100 million years ago and earlier) it probably was much higher, in the 2000 ppmv range.
Second, scientists have said that once we stop increasing the level of CO2 in the atmosphere it will take over 1000 years for natural processes to reduce the level of CO2 back to pre-industrial levels.
