This is true. One major volcano spewing its guts will put more 'pollutants' into the stratosphere than an entire years worth of human industry . . . and yet leftist nutters blame human activities for . . . everything. Note that none of them are will to give up the resulting fruit harvested from those industrial and technological and textile activities.
Seen how lucky we have been getting lately with so many asteroids flying by really close lately but not hitting us? I bet any of those could make more climate change in just a few minutes than humans ever did. Praise God.
And in a sense the planet is like a pressure cooker. Without some kind of 'release valve' the planet may have gone through worse long ago. . .and again Praise God for volcanoes.