3. Conjugue les verbes suivants aux temps qui conviennent : Motor vehicles (be) responsible for high levels of pollution in the last decades. b. Gases from exhaust fumes (cause) acid rains and (destroy) the rainforests for many years. c. Every year, British people (throw away) seven billions drink cans. d. Two years ago, I ( join) the Going For Green Campaign. e. If we (reduce) our consumption of energy, we'd pollute less. If we (reduce) our consumption of energy, we 'll pollute less. 9. We (campaign) twice a week, on Saturdays and Wednesdays.​