Nuclear security
The gravest danger we face is fast-approaching nuclear instability. Many believe it is possible safely to arrive at nuclear zero. It is not. Enough warheads to bring any country to its knees can fit in a space volumetrically equivalent to a Manhattan studio apartment. Try to find that in the vastness of Russia, China, or Iran. Even ICBMs and their transporter-erector-launchers can easily be concealed in warehouses, tunnels and caves. Nuclear weapons age out, but, thanks to supercomputing, reliable replacements can be manufactured with only minor physical testing. Unaccounted fissile material sloshing around the world can, with admitted difficulty, be fashioned into weapons. And when rogue states such as North Korea and Iran build their bombs, our response has been either impotence or a ticket to ride.
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