Those who think about national security love to bandy acronyms such as ATACMS (Army Tactical Missile System) and WOMBAT (Weapon of Magnesium, Battalion, Anti-Tank). They need to add AMOC to the list. The Atlantic Meridional Overturning Circulation is not a weapons system. But it could lay waste a continent—specifically, Europe—to an extent that only a nuclear war could outmatch.
