Ключевые слова: air, atmosphere, car, carbon, cloud, co2, combustion, concept, contamination, damage, decrease, dioxide, earth, eco, ecology, electric, emission, emit, energy, environment, environmental, exhaust, factory, gas, global, green, greenhouse, icon, industry, line, nature, outline, plant, pollutant, pollute, pollution, product, reduce, reduction, renewable, sign, smog, smoke, solar, symbol, water,