isn't it kind of inevitable regardless if we're speeding it up or not
with volcanoes shooting out much more carbon than cars could dream of and all that
Volcanoes don't emit nearly as much as humans do, surprisingly.
Even more surprisingly is that volcanoes have the
opposite effect that humans do! Volcanoes don't just give off CO2, they also give off different chemicals that actually end up outright preventing heating, resulting in a net cooling for at least a couple of years after a major eruption like Mt. St. Helen's.
You can take a look at this to see all the different contributions and
exactly how they add up to line up perfectly with what we observe (In an
extremely beautiful graph):
https://www.bloomberg.com/graphics/2015-whats-warming-the-world/It includes sources and information about how the data was gathered and put together at the bottom of the page.
It is 100%, without a doubt, unquestionably us causing global warming.