Ключевые слова: city, clean, climate, concept, conservation, countryside, earth, ecology, electricity, energy, environment, environmental, environmentalism, exchange, future, generative, have, heaven, idea, island, lasting, modern, nature, objective, pathway, photovoltaic, problem, protect, renewable, renewable energy, road, skyline, solar cell, solar energy, stream, street, sun, sustainability, view, vision, visionary, way, wind, wind power,