Choose the right answer.

1. If we ... cars, we wouldn’t have wiped out so many endangered animals.
2. If I was responsible for the environmental laws in my town, I ... for more cycle lanes.
3. If the temperature ... much hotter in my country, people would take part in protests against global warming.
4. People would have to dispose of their petrol cars and use electric cars if fossil fuels ... .
5. If people ... on flying, they would reduce their carbon footprint.