Get a grip on the Cosmic Time Frame.
The past few centuries are a mere drop in the cosmic bucket of time. The factors that I listed are predominately very long-term (except for vulcanism). Nobody knows for sure exactly what happened or will happen.
You will note that I did recommend switching over to renewable energy sources. I do NOT suggest that we ignore any possible human influence. I only caution against blaming things on human influences alone when there are far larger forces in operation.