By contrast, the whole international community spends less than $400 million per year on the International Atomic Energy Agency, the primary institution for monitoring and preventing the spread of nuclear weapons; that's less than one day's worth of war costs. The U.S. government spends just $1 billion per year securing and destroying loose nuclear weapons and bomb-making materials, or less than two days' worth of war costs; and Washington spends a total of just $7 billion per year on combating global warming, or a whopping two weeks' worth of war costs.