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Q6850
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Addition of harmful smoke, gases and chemicals to the environment in large quantities is called ______
Q6851
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Cutting down of trees for farming and housing purposes is called ______.
Q6852
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Releasing chemicals, waste, plastics into the water is called _____.
Q6853
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Scientists are warning us that the rise in earth's temperature causes ________.
Q6854
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Shyam avoids the use of plastic and chemical fertilizers. He is practising a _____.