The Guardian calls for NATO to declare war on Russia
(archive.ph)
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All of our current nuclear warheads are "boosted yield" systems, where tritium is injected into the warhead just before detonation to increase weapon yield. But tritium has a half-life of just over 12 years, and once it decays, it becomes a neutron absorber, thus reducing weapon yield.
Problem is, there's no major producer of tritium in the US anymore... we just buy ours from overseas.
NRC looked at restarting tritium production (easiest method is to put boron rods into a reactor) around the turn of the century. The public protested, and the project was cancelled.