Ключевые слова: air, atmosphere, background, badge, black, bubble, button, carbon, chemical, chemistry, climate, cloud, co2, concept, contamination, damage, danger, design, dioxide, eco, ecological, ecology, effect, element, emblem, emission, emit, environment, environmental, exhaust, factory, flat, formula, gas, global, graphic, greenhouse, icon, illustration, isolated, label, nature, pollute, pollution, sign, smog, smoke, symbol, white,