a thick, dark fog that appears when there is high humidity and a strong concentration of polluted particles in the air. - SMOG, the destruction of forests by man in order to obtain timber or fertile soil. - DEFORESTATION, ain which contains a high level of acid that can damage the environment - ACID RAIN, a type of farming that respects the environment by not using chemical substances - ORGANIC FARMING, chemical products used against insects, mice, etc - PESTICIDES, a type of oxygen that exists in the highest part of the Earth’s atmosphere - OZONE, or residential waste, is disposable materials generated by households. - DOMESTIC WASTE, the basic material from which a product is made. - RAW MATERIALS,

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