It's dry - It's wet

[Arthur Dent]

It's both. Nature does go through cycles. Like the Dust Bowl during the Great Depression.

But, we are also making it worse. Sure, volcanos through a ton of crap into the atmosphere, but most of it filters out naturally in a short time.

And the volcanic ash, sulfer, and other basic chemicals expelled can't compare to the complex hydrocarbons and other chemicals expelled by factories.