To get really controversial the highest environmental priority is atmospheric co2 and landfill space doesn’t have a scratch on it in terms of harm.
Plastics and other carbon containing substances buried underground sounds terrible at face value but the thing that should really make you worry is the amount of carbon released into the atmosphere. Atmospheric pollution can often coincide with the amount of trash you create but in general if your focus is on landfill rather than atmosphere you’re focusing on something that doesn’t have a scratch in levels of importance.
In fact if we can find a way to landfill co2 rapidly in a net co2 negative way that may be our best hope right now (repeatedly growing and burying large amounts of biomass for example).
Geoengineering could maybe bring temperatures back down, but you can't just replant an old growth forest and out all the old plants, fungi and animals back.
If microplastics are behind the fertility drop, reverse flynn effect or obesity crisis they would also be more important in the ~100 year timeline.
Plastics and other carbon containing substances buried underground sounds terrible at face value but the thing that should really make you worry is the amount of carbon released into the atmosphere. Atmospheric pollution can often coincide with the amount of trash you create but in general if your focus is on landfill rather than atmosphere you’re focusing on something that doesn’t have a scratch in levels of importance.
In fact if we can find a way to landfill co2 rapidly in a net co2 negative way that may be our best hope right now (repeatedly growing and burying large amounts of biomass for example).