Ключевые слова: backdrop, background, battery, biological, can, capsule, carbon dioxide, cartoon, chemistry, concept, conservation, conservative, crane, drop, earth, ecological, ecology, energy, environment, flat, gas, green, hand, heal, home, icon, illustration, industrial, industry, infographic, innovation, isolated, lightbulb, lung, nature, oxygen, pictogram, plant, plug, power plant, recycle, reduce, reuse, solar cell, sprout, stethoscope, technology, tree, windmill, world,