Ключевые слова: air, art, atmosphere, background, bright, carbon, chemistry, cloud, co2, color, colorful, concept, contour, design, dioxide, eco, ecology, effect, emission, emissions, environment, exhaust, formula, gas, global, glowing, graphic, green, greenhouse, icon, illustration, isolated, light, line, linear, lineart, neon, outline, pollution, purple, reduction, sign, smog, smoke, symbol, warming,