I don't believe WE are destroying the earth or capable of it. Are we putting up pollutants, yes, destroying? No.
My reason for volcanism is that more dangerous pollutants are put into our air that you and I breathe and water that you and I swim in.
The earth has it's own cleaning system, the theory that man's pollutants are causing a warming or cooling trend is "THEORY" too ridiculous to buy into. Like I said, one volcano eruption is more than man has put out in it's lifetime.