[scientismer]

Oil, coal and gas are actually produced from biological sources, plants that lived millions of years ago.

It's even a bit ironic - there was a time when nature hadn't yet learnt how to break down trees, so a lot of trees accumulated (simplified, I think it is more a then new trick of plant cells that had no "natural enemies"). That organic material is what oil, coal and gas are made from. The irony is that from oil we now make plastic, and nature has not yet found a way to break down plastic. Since microbes can now digest trees, no new oil will be created. But maybe if large enough plastic deposits are accumulated, it could happen again?

(Details may be wrong, as I was too lazy to google, but the gist is, fossil fuels are actually made from organic sources).