The document discusses several alternative energy resources including solar, wind, water, liquid biofuels, solid biomass, and geothermal energy. Solar energy can be used to heat and cool buildings and air. Wind power is the fastest growing renewable energy and provides less than 1% of global energy. Water power harnesses kinetic energy from rivers and oceans. Liquid biofuels include ethanol and biodiesel which can be made from waste oils and fuels. Solid biomass is commonly used as a combustible fuel. Geothermal energy taps into the earth's heat from deep underground to generate power.