Ключевые слова: alternative, art, background, barrel, bio, biodiesel, biofuel, biogas, biomass, brick, canister, concept, contour, diesel, eco, ecological, ecology, energy, environment, environmental, fuel, gas, gasoline, glowing, icon, illustration, industrial, industry, isolated, leaf, light, line, linear, lineart, natural, nature, neon, oil, outline, petrol, petroleum, plant, power, protection, recycle, renewable, wall,