There are still scientists who dispute the existence of ____ and say there has been no real change in temperature. The draining of ____ to build factories has enraged environmentalists. On some days in summer the ____ is so bad that people with breathing problems are advised to stay at home. Carbon dioxide ____ must be cut if we want to stop polluting the air. ____ of waste at sea is forbidden by international law. Lack of rain means that large areas of previously fertile land in Africa are threatened with ____. We must develop ____ sources and not depend on oil. The problem with most plastics is that they are not ____ and cannot be reabsorbed by the earth. The build up of a layer of gases trapped in the earth's atmosphere which prevents heat escaping is known as the ____. Steady ____n in the Himalayas has resulted in catastrophic floods in countries at sea level. Scientists first became aware of the effects of certain gases on the environment when they found a hole in the ____ over Antarctica. As cities expand, many animals are being driven from their natural ____ Plant and animal species dying out means the loss of the ____ of the planet.

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