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But how much insulation you need can be entirely dependent on the climate of the surrounding area.  You'll need to establish what R-value (the rating system used for insulation) is proper for optimum efficiency in your home. The higher the R-value, the greater the effectiveness of the insulation. By simply picking the right insulation, even if the material itself is not green in nature, you will be saving energy, and thus making a contribution to a healthier environment.

Here are three typical forms of insulation:

Blankets: These come as rolls or batts and are made from flexible mineral fibers, including fiberglass and rock wool. On the positive side, this form of insulation can be bought with a flame-resistant facing. Additionally, it comes in standard sizing, made to fit between wall studs and floor joists. On the other hand, fiberglass and rock wool are known eye, throat, and skin irritants. Fiberglass is made through an energy intensive manufacturing process, and many fiberglass products contain formaldehyde, a possible carcinogen.

Blown-in: Blown-in loose fill is done by professionals using equipment to blow in loose fibers or pellets. This can be done with cellulose (a great green option), fiberglass, or rock wool. On the pro side, it's good for oddly shaped areas that rolls don't form to. On the con side, cellulose not mixed with foams is apt to settle and to absorb moisture.

Foam Insulation: And finally, there is foam insulation. Foam insulations, however, are made from petrochemicals and are not recyclable.

There are still greener options gaining in popularity. These include recycled paper insulation, recycled denim, hemp, and cotton. Be sure to talk to your contractor about what options would be a good, and green, fit for your home.