The company has revamped its method of making liquid polystyrene insulation to appease state and federal lawmakers to reduce greenhouse gas production by 70 percent, but that may not be enough. The company will continue to use hydrofluorocarbons, which environmentalists don't want because of their greenhouse gas emissions.

Owens-Corning says the process should be approved because insulation increases a home's energy-efficiency, and therefore reduces petrochemical use.

I'm getting tired of companies who purport to be green just because their process uses less energy. Energy efficiency does not equate sustainability, and should not be given the green label without scrutiny. Being "less worse" isn't good enough if there are other options available.

It is interesting that state regulators who grant licenses are becoming key instruments to force companies to green their manufacturing processes. Coal power plants permits are being denied because of their greenhouse gas implications, which will lead to more court battles. Don't underestimate the power of the local utility commisions and zoning boards in creating a more sustainable future.