Ключевые слова: air, atmosphere, car, chemical, chimney, city, climate, co2, concept, damage, danger, dirty, eco, ecology, ecosystem, emission, energy, environment, environmental, factory, fog, fuel, garbage, gas, global, health, industrial, industry, nature, plant, plastic, polluted, pollution, problem, protection, radiation, recycle, rubbish, sea, smog, smoke, symbol, toxic, traffic, transport, trash, underwater, warming, waste, water,