[gnaritas]

> The idea that we can do something about it, i.e. by decreasing the use of fossil fuels, is based entirely on the idea that we caused it

That's a misconception you're holding onto. Those working on mitigating carbon in the atmosphere don't' care what the source of the carbon is. Whether we caused it or not simply doesn't matter.

> If we didn't cause it, the whole edifice crumbles.

The attempts to stop a calamity are worthwhile regardless of the original source of the calamity. Engineering the environment does not depend on whether we think we accidentally engineered it before.