Reasons: toxic fumes from factories, car exhausts, heavy traffic, deforestation, people burn trash from the dumps, Current Situation: high level of CO2, smog over the cities, lungs diseases (cancer) and allergies, acid rain, global warming, greenhouse effect, destruction of ozone layer, Ways out: use more public transport and bikes instead of cars, fabrics should install filters, plant trees, use electro cars ( like Tesla), reuse and recycle trash,

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