Many plastics are not [?]. This means that they cannot be broken down by [?].

Getting rid of them is not easy; some plastics will last for hundreds of years. They fill up sites. Sometimes plastic items are dropped as [?] by people who are not civilised. They end up blowing about and get caught in trees and hedges. If they get by a wild animal, that wild animal could die. Although plastics tend not to be [?], they can choke or clog up the animal.

Burning is no good, because plastics can [?] to give off very toxic fumes that are bad for the [?].

Many plastics can be [?], so that they are down and moulded into new objects.