People would have more oxygen if they had more trees/green areas.
If the authorities improved public transport, people wouldn't buy so many cars.
If people used bicycles, cities would be less polluted.
If people recycled things, there wouldn't be so much rubbish everywhere.
If the authorities created more parks, children would be able to play safely.
People would have more oxygen if they had more trees/green areas.
If the authorities improved public transport, people wouldn't buy so many cars.
If people used bicycles, cities would be less polluted.
If people recycled things, there wouldn't be so much rubbish everywhere.
If the authorities created more parks, children would be able to play safely.