Ключевые слова: air, architecture, back, background, blank, blue, business, childhood, chimney, clean, cold, color, coloring, crayons, disposal, draw, drawing, drop, echological, echology, energy, fresh, fuel, gas, green, modern, plant, production, purity, recycle, sensation, simple, simplicity, sky, sostenibility, stationery, stroke, supplies, thermal, tip, trash, treatment, waste, water, white, wooden,