Half of the modern world is reliant on petroleum based products. Gasoline and Diesel are about 70% of modern crude oil usage, but that remaining 30% is everywhere.

Perhaps ethane based plastics not affected very much in the USA at least. Its a "waste product" from shale gas extraction. There are laws on how much producers can burn, and if they don't have a home for it they have to stop extracting methane. So they price it so cheap its essentially paying people to take it so they can go back to extracting methane. The USA produces 40% of the worlds ethane. This is also one of the reasons plastic recycling isn't financially feasible here. Ethane is just too cheap to make virgin plastic vs the costly process of collection and recycling of non-virgin plastics. source

Not any plastic. For example, much of the ethylene used to make PE is a common byproduct of natural gas production, that occurs in such quantity that producers almost have to pay to have it taken away.

Better load up on 3D printing filament before it gets worse