[mr_toad]

It’s underground because anaerobic decay of organic material with heat and pressure produces oil. Chemicals aren’t inherently good or evil. Some, like oxygen, we’ve evolved to live with, while some we haven’t had the chance.

In millions of years something will probably evolve to eat all this plastic, just like it did with cellulose.

[eru]

Oxygen originally killed off most of the biosphere.

https://en.wikipedia.org/wiki/Great_Oxidation_Event