Ключевые слова: air, air pollution, air space, aircraft, aviation, background, blue, building, chemical, chemtrail, climate, cloud, condensation, contrail, environment, environmental, geoengineering, house, industry, jet, jet stream, landscape, line, many, meteorology, modification, multiple, nature, no people, nobody, outdoors, plane, pollution, roof, sky, smog, stripe, sun, traffic, trail, travel, vapor, weather, weather modification, white,