This document discusses various renewable energy resources including passive and active solar heating, solar power towers, solar thermal plants, solar cookers, solar hydrogen, hydropower, tidal power, biomass, and geothermal energy. It provides advantages and disadvantages of each resource. Some key renewable energy resources mentioned are solar, wind, hydropower, biomass, and geothermal. The document concludes with solutions for sustainable energy such as improving energy efficiency, increasing local renewable resources, finding transitional resources, promoting research and development, educating the public, and implementing constructive subsidies.