“Pollute” is a B2 level verb that is used to talk about the action of putting something into the environment (water, air, sea etc…) that causes harm to animals, people or the Earth in general.
Companies are now starting to be punished if they are found to be (4)…… the river with toxic chemicals.
(4) POLLUTION –
Examiner: “How do you think pollution can be reduced in your country?”
Candidate: “Well, I would say that businesses should be encouraged to stop polluting by giving them some kind of financial incentive…”