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To speak about environmental problems, you need the appropriate vocabulary.
  
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Extinction of animals - when types of animal no longer exist;
 
Soil erosion - destruction of the top layer of earth that plants grow in;
 
Ozone depletion - reduction of the amount of ozone;
 
Loss of biodiversity - when we do not have enough ​types of ​plants and ​animals that ​exist in a ​particular ​area or in the ​world ​generally, or the ​problem of ​protecting this;
 
Depletion of natural resources - reduction of natural resources;
 
Global warming - when the air around the world becomes warmer because of pollution;
 
Greenhouse effect - the gradual warming of the Earth's surface caused by an increase in pollution and gases in the air;
 
Radioactive contamination - pollution containing harmful radiation.
 
Examples:
 
We are afraid of radioactive contamination.
  
People try to do something to avoid ozone depletion.
  
Have you ever heard about loss of biodiversity?