Ключевые слова: air, art, atmosphere, background, black, bubble, button, carbon, chemistry, cloud, co2, combustion, concept, contamination, damage, design, dioxide, eco, ecology, effect, emission, emissions, emits, environment, environmental, exhaust, flat, formula, garbage, gas, global, greenhouse, icon, illustration, isolated, label, modern, nature, pollutant, pollute, pollution, sign, smog, smoke, symbol, warming, warning, white,