Choose the correct prepositions to complete the sentences.
1. Scientists have put global warming on / down to industrial pollution.
2. International governments need to set out / on new rules to help protect many animal species.
3. We go over / through a lot of food every week, but we don't throw much off / away.
4. Governments need to speed on / up research into environmental problems.
5. Big companies must pay over / up if they break environmental laws.

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