After the Cold War ended, large inventories of nuclear weapons and facilities remained. Some are being recycled, dismantled, or recovered as valuable substances. Large amounts of money and resources – which would have been spent on developing nuclear weapons in the Soviet Union, had the arms race continued – were instead used for repairing the environmental damage produced by the nuclear arms race, and almost all former production sites are now major cleanup sites. In the United States, the plutonium production facility at Hanford, Washington and the plutonium pit fabrication facility at Rocky Flats, Colorado are among the most polluted sites.