Ключевые слова: air, anti, art, background, black, bubble, carbon, cloud, co2, combustion, concept, contamination, creative, design, dioxide, eco, ecology, emission, emissions, emit, energy, environment, exhaust, flat, formula, gas, global, graphic, greenhouse, icon, illustration, industry, isolated, manufacturing, pictogram, pollutant, pollute, pollution, power, reduction, round, sign, smog, smoke, symbol, technology, text, warming,