I am sorry - I am no tree hugger, but when total nonsense is spouted it sometimes has to be challenged. It is certainly true that volcanoes emit Co2, but all the world's volcanoes put together emit fewer "greenhouse" gases anually than does cement production - never mind other human activities including vehicle emissions.
Conservative estimates, based on real science (not wishful thinking) put mankind's Co2 emissions at over 100 times that from all geological events combined on an annual basis. I have no idea whether this is having a marked effect on our climate, but lets stick to facts please.