Ключевые слова: alternative, business, certificate, choice, conservation, control, cooperation, coordination, developing, earth, ecology, electricity, energy, environment, factory, fuel, future, global, green, humanity, impact, improvement, nature, performance, plan, planet, pollution, problem, production, protection, recycle, reduce, renewable, resource, reuse, risk, save, solar, source, stock, supply, system, technology, transportation, wind,