Ключевые слова: alternative, background, carbon, change, clean, co2, concept, conceptual, conservation, development, dioxide, eco, ecofriendly, ecologic, ecological, ecology, energy, environment, environmental, environmentally, friendly, future, generation, global, green, illustration, industrial, industry, power, progress, recycling, reduce, renewable, resource, save, sign, sky, solar, solarpower, sustainability, sustainable, technology, warming,