There are alternatives to fiberglass insulation that provide better thermal resistance and are safer and more environmentally friendly.
Top 5 Green Insulation Options
Insulation R-Values Chart and Buyer Guide
Types of Insulation for Your Home - This Old House
6 Alternative BUILDING INSULATION Materials
Fiberglass Insulation Alternatives
All About Insulation for Your Home - This Old House
Alternatives to Traditional Insulation: What are My Options?
Insulation Materials Department of Energy
Basement Insulation, Reflective Foil Basement Insulation
Types of Attic Insulation: Pros and Cons