These guys just don't want to accept the facts, it doesn't suit what they want to think.
Yes Volcanoes are already part of the underlying carbon cycle as are rain forrests and trees that absorbed CO2, but due to the mass land clearing and deforestation they are less able to absorb the natural occurring CO2 let alone the additional CO2 humans create.
We have to remember the earth is an enclosed eco system, like in an enclosed room there is only some many farts before it becomes unbearable
