Fill in the gaps with the right forms of verbs in the brackets. Deforestation (a) — (mean) cutting down trees in large numbers. The causes of deforestation are many. People cut down trees in large number to (b) — (draw) quick profit from them. The lucrative price of wood also (c) — (allure) people to cut trees. This destruction disturbs our ecological balance. The existence of animals are going to be (d) — (threaten). Due to deforestation, carbon dioxide is (e) — (increase) worldwide. As a result, the world is getting warmer.