TEXT 1. POLLUTION Factories, power stations and motor vehicles (1) . pump large quantities of carbon dioxide and other gases into the air. To avoid the greenhouse effect autho- rities (2) . control toxic wastes in their countries. A lot of petrol contains lead, which (3) .. cause brain damage in children. Most cars owners(4) .. use unleaded petrol today or electric cnrs. Some poisonous gases dissolve in water and then fal to the earth as acid raiu. Acid ram also damages trees and buildings, and (5).. kill fish in lakes and rivers. Rivers 16)siso be polluted by industrial waste. That is why factoryemissions, use of chemicaland pesticides (7) be reduced or limited.​

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