GreenHomeGuide, one of the best general information sites for folks trying to maintain, restore or remodel their home in an environmentally conscious way, has a great article on three safe and renewable insulation products.

If you’ve ever struggled with huge, unwieldy bats of fiberglass
insulation or forced your way through a crawlspace, wrestling with a
hose and trying to blow fluffy white fibers into every corner — all the
while wondering what those toxic chemicals and shards of fiberglass are
doing to your body — you’ll be relieved to know that there are green
alternatives.
Here are three of our favorites for do-it-yourselfers.