Ключевые слова: air, background, carbon, care, change, clean, climate, co2, concept, conservation, danger, dioxide, disaster, earth, eco, ecology, effect, elements, emissions, energy, environment, environmental, gas, global, globe, graph, hot, illustration, natural, nature, oil, periodic, planet, pollution, power, protection, recycle, recycling, science, sign, sky, symbol, system, temperature, warming, weather, word, world,