Ключевые слова: air, anti, atmosphere, background, black, bubble, button, carbon, chemistry, cloud, co2, combustion, concept, contamination, damage, dioxide, eco, ecology, effect, emission, emissions, emit, environment, environmental, exhaust, factory, flat, formula, gas, global, graphic, greenhouse, icon, illustration, industry, isolated, label, pollutant, pollute, pollution, sign, smog, smoke, symbol, text, warming, warning, white,