I don’t know if the “science is settled” regarding what I read regarding plastics in the environment. But, doesn’t burying it in a landfill eventually cause it to leach into the water supply, etc.. I don’t know about you, but, I’d prefer not to drink water with plastic byproducts in it.
No. It doesn’t leach. In the USA they are sealed...for other reasons. Come off the cliff edge . ..you will be OK.