This document discusses ways to convert waste into wealth through various technologies. It defines waste and lists common sources of waste. It then outlines the principles of reducing, reusing, recycling, and recovering waste. Several methods are described to convert organic waste into valuable products like compost, biofuel, charcoal briquettes, biogas, and mushrooms. Agro-waste can be used for mushroom cultivation and ethanol production. Fruit waste is also discussed as a source for citric acid production. The goal is to find economic uses for waste and reduce environmental impacts.