Thousands of ____ are written about global warming. The world is getting ____ because of ____ gases. Possible ____ of global warming is ____ of ice caps,  extreme ____ conditions and natural disasters. Greenhouse gases are produced when ____ fuels  are burnt up by factories and ____ stations. ____ is cutting down and burning up forests.  The trees are cut down because people need ____  for building houses and furniture and space for towns and cities. Trees produce ____ and rain, therefore,  deforestation is ____ for the life on Earth.

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