I've heard different perspectives on plastics in terms of ecological and environmental impact. From a decarbonization perspective, there's an argument that seems to have merit: that it's a good method of sequestration as long as it's buried in a landfill and isn't of the types (PVC, EPS, etc) that can decompose carcinogenic or teratogenic plasticizers into the environment. Most of the plastic waste by tonnage is PE or PP and comprised of fairly clean hydrocarbon chains.