U10 e9 sentences

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empezar lección

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término		definición
There are still scientists who dispute the existence of global warming and say there has been no real change in temperature. empezar lección		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. empezar lección		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. empezar lección		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. empezar lección		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. empezar lección		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. empezar lección		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. empezar lección		Despite attempts to persuade people to conserve water, the depletion of water supplies continues.

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