There are many earth friendly ways to insulate your home. Here are a few.
1) Loose Fill Cellulose: this is made from recycled newspapers, formaldehyde-free and treated to be fire resistant.
2)Spray-in Soy foam: Typically made from natural soy, they act like other spray-ins, but do not contain formaldehyde, are environmentally safer thanb their conventional spray-ins.
3)Batt or blanket insulation: Usually made from natural fibers, such as wool and cotton, and can contain recycled-material such as old blue jeans.
These can help insulate almost anywhere in your home to help save energy!
Citation:Green Now! Here's How.