Keywords
agriculture, air pollution, architecture, blast furnance, blue sky, branch of the economy, building exterior, central europe, chimney, color, cooling tower, cultivated land, day, duisburg, economy, energy management, energy source, environment, environmental contamination, environmental pollution, environmental protection, europe, field, foundry, geography, germany, horizontal, industry, material, mittal stahlwerk, nature, nobody, north rhine-westphalia, outdoor, photograph, power plant, ruhr area, ruhrort, sky, smoke, smoke stack, steel industry, steel mill, technology, view from below, western europe, western germany, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, 3391152