Cellulose insulation is a great green solution for your home. Environmentally speaking it’s one of the best options because it’s made mostly of recycled newspaper and cardboard. It’s composed of 75-85% recycled paper fiber and the other 15% is a fire retardant. Though cellulose insulation is often regarded as a budgeted form of attic insulation, it has been proven to offer better thermal resistance than the fiberglass alternative. Cellulose insulation is more effective because it is made of natural fibers that are inherently equipped with better insulation properties. They are poor conductors of heat.