Your ignorance is your own, we DO know enough...
We know that humans are the PRIMARY IF NOT SOLE source of the increasing CO2 - your comments about vulcanism just highlight your ignorance on this topic... We are creating more CO2 sources, while destroying the sinks...
We know increasing CO2 increases global temperatures, and we see the temperatures increasing... We may not know how much damage this will do, which is WHY we should stop modifying our climate!
There IS a reason why there is a strong scientific consensus on this, and there is a reason why most of those denying the problem are uneducated on the topic- such as yourself...