Cars and buses produce a lot of noise - that causes noise pollution., Plants and factories throw a lot of industrial waste into the air - that causes air pollution., Plants and factories produce much waste and throw it into rivers and seas - that causes water pollution., People drop litter everywhere - that causes water and land pollution., Smoke from factories and plants goes into  - the air that causes air pollution., Big cities are overcrowded, there's no space to live - that causes overpopulation., People cut down forests - that causes deforestation., People produce a lot of waste - that causes large landfill sites., Exhaust fumes from cars - cause air pollution.,


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