Ключевые слова: alternative, assets, bio, bulb, charge, choice, clean, collection, concept, conservation, diagram, earth, eco, ecology, educational, electricity, elements, energy, environmental, generator, green, group, illustration, labeled, list, outline, panel, power, production, renewable, resource, save, scheme, set, solar, solution, source, sources, sun, sunlight, supply, sustainable, system, technology, thermal, turbine, water, wind,