Ключевые слова: background, beautiful, beauty in nature, blue, carbon dioxide, change, changes, clear, climate, cloud, cloudscape, cloudy, co2, contrast, cotton, cumulus, day, environment, fluffy, high, layer, like, no people, only, outdoor, ozone, partly, picturesque, scenics, shining, shiny, sky, skyonly, skyscape, stratosphere, summer, sun, sunny, tranquil, vertical, weather,