Ключевые слова: alternative, background, bin, car, collection, concept, contour, design, disaster, ecological, ecology, energy, environment, environmental, exhaust, factory, fire, flat, forest, fume, global warming, group, hazard, icon, illustration, industry, line, linear, logo, manufacture, nature, outline, park, pictogram, planet, protection, recycling, set, shape, simple, source, symbol, thin, toxic, tree, waste,