I'm sure the insects have figured this out by now.
" Deliberate physical attack and sabotage of the grid are also major threats (has already happened).
But perhaps the biggest danger would be an electromagnetic pulse (EMP) created by detonation of a nuclear device above the atmosphere (Already threatened by the Norks).
And yet we wonder why Russia has already underground facilities to house, feed, and maintain millions of their population .
If you have miles and acres of food, but if you don't have the fuel/energy to get it where it is needed, it doesn't really matter, because it will spoil in the fields, or on the docks.
H/T to DuncanWaring, Tolerance Sucks Rocks, and bitt