The amount of ordnance expended and oil burned and spilled from sinking ships in WWII dwarfs all the recent conflicts combined and the planet survived just fine.
So called fossil fuels break down into fertilizer in the ocean, and on land it is just a nuisance and takes land out of usage for a few years. Oil is a natural substance on the Earth and on many other planets. No dinosaurs or plant life, yet they still have hydrocarbons.