Book excerpt: An essential how-to on powering your home with sun, wind, water, and more. For readers wanting to save money-and the planet-by using alternative energy, this book provides everything they need to know. The five basic sources are fully covered: sun, wind, water, earth, and bio. The benefits, what is needed, and whether it will work for a particular home are all carefully laid out in this comprehensive overview: ? Solar energy for home heating, water heating, and electricity ? Wind power, hydrogen, and micro hydro power ? Heat pumps-air, geothermal, and water source ? Heating with wood and going bio