You're wrong on both accounts, Jake.  
1. No "similar change" has taken place while human civilization has been on the planet.  What you are missing here is the incredibly fast RATE at which our earth is warming present.  This rate is unprecedented in at least the last 800,000 years.  In addition, we know for sure that smaller changes have led us into and out of ice ages.
2. The CO2 volcano myth has long since been debunked.  Even at the highest end estimate for annual volcanic emissions, they put out about 1/130th the CO2 that human industrialized processes do.  So this is a no-go, too.

Have any other right-wing talking points without any scientific basis?  Set some more up and I'll shoot them down too: You can't beat the overwhelming evidence that counters your beliefs.

You are absolutely delusional and being willfully ignorant to continue the "demented leftists" money-grabbing conspiracy.