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Question		Answer
There are still scientists who dispute the existence of global warming and say there has been no real change in temperature. start learning		The training of wetlands to build factories has enraged environmentalists.
On some days in the summer the smog is so bad that people with breathing problems are advised to stay at home. start learning		Dumping 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 desertification. start learning		We must develop renewable energy sources and not depend on oil.
The problem with most plastics is that they are not biodegradable and cannot be reabsorbed by the earth. start learning		The build up of a layer of gases trapped in the earth’s atmosphere which prevents heat escaping is known as the greenhouse effect.
Steady deforestation in the Himalayas has resulted in catastrophic floods in countries at sea level. start learning		Scientists first became aware of the effects of certain gases on the environment when they found a hole in the ozone layer over Antarctica.
As cities expand, many animals are being drivel from their natural habitats. start learning		Plant and animal species dying out means the loss of the biodiversity of the planet.
Since toxic waste continues to be hazardous for a long time it is difficult to dispose of it safely. start learning		Despite attempts to persuade people to conserve water, the depletion of water supplies continues.

U10 e9 sentences