Match the words in A to the words in B and use them to complete the sentences.

1. Toxic fumes are very harmful to the environment. 2. A lot of factory waste is dumped into this river. 3. Acid rain is caused by chemicals. 4. Natural power is environmentally friendly. 5. Many plant species are in danger of dying out. 6. Forest fires cause many animals to lose their natural habitats. 7. How can I avoid breathing toxic fumes from cars while cycling in the city?