Its best not to get tied up in apocalyptical thinking...
Take Cuba for example - when the Soviet Union fell,
Cuba was cut off from most of its markets and all the energy
and food imported was severely cut - the economy dropped almost 75%.
Did they end up eating each other like in the movie "The Road?"
NO! They started planting urban food forests and rooftop gardens!
We will do this all soon - and we'll realize that its the best
thing that could've ever happened to us.