Ключевые слова: air, anti, atmosphere, black, c02, carbon, certificate, clean, cloud, co2, combustion, contamination, decrease, design, dioxide, down, eco, ecological, ecology, effect, emission, energy, environment, environmental, exhaust, factory, flat, gas, global, green, greenhouse, icon, idly, illustration, isolated, logo, natural, neutral, pictogram, pollute, pollution, reduce, reduction, sign, smog, smoke, symbol, warning, web,