If the current CO2 rise is volcanic, then we would have to explain why now. There are 20k years of high res (annual) ice cores with CO2 measurements. No big rises or falls in CO2 until the recent one. There are other CO2 proxies that show up to 50-60 ppm rapid rises. But our current rise is 120 and growing at 2ppm per year with no apparent rise in volcanic activity.
And you believe those figures because...? Haven't they lied to us about almost everything before?