Ключевые слова: 2050, biofuel, bulb, carbon, city, clean, climate, co2, concept, conservation, creative, cut, eco, ecology, efficiency, electricity, emission, energy, environment, footprint, fossil, future, gas, geothermal, green, greenhouse, hydro, idea, innovation, light, natural, neutral, paper, planet, recovery, recycle, reduction, renewable, reuse, save, solar, sustainability, sustainable, technology, transition, waste, wind,