Ключевые слова: balance, blue, building, buildings, city, conservation, construction, earth, ecological, ecological balance, ecology, ecosystem, energy, environment, environmental, environmentalism, future, global, global warming, globe, grass, green, growth, hand, holding, hope, landscape, light, nature, new life, orange, pollution, protection, responsibility, sky, skyline, sunrise, sunset, sustainability, tree, urban, urban landscape, world,