I find it totally amazing that people refuse to believe without having absolute proof. Common sense should prevail on both sides but it does not.
The amount of CO2 being emitted into the atmosphere is not a natural phenomena. The amount of pollution we dump into the rivers and seas is not a natural phenomena. The amount of toxic waste we produce is not a natural phenomena. We are stripping the planet's natural resources in unnatural quantities. Yet we are expected to believe that the planet will deal with this unnatural chemical imbalance because it always has done. "Life will prevail" is what people say. When we are all dead and buried and the last human being has dug her own grave, perhaps then, if there are any other species left alive. If you cannot see the flaw in your argument then there is no hope at all.