One of the easiest measures for CFC replacement was the application of carbon dioxide in producing foams for polystyrene plastic foams used in packing, food containers, and insulation. Global production of polystyrene foam amounts to about 5 million metric tons each year. The volume (and waste disposal problems) with this material can be appreciated considering that the foam is about 95% gas used as a blowing agent in making it. The Dow Chemical Company won the 1996 Presidential Green Challenge Award for their development of a process to use carbon dioxide as a complete replacement for CFCs in making polystyrene foam. (The incremental addition of greenhouse gas carbon dioxide from this application is miniscule and co2 by-product of processes such as fermentation to produce ethanol can be used for foam blowing.)