[@Dinh AaronMk]

Improvise. Adapt. Overcome.

We humans are rather resilient creatures - and we have yet to scratch some avenues of research and technology. Due to either moral, religious, economic or political reasons. 

In all honesty, conflict breeds progress - and once the initial shock is survived, mankind would usually either find new ways. If something proves costly or unable to be reached - say coal or land - then you adapt and start developing new ways or you die.

When basic survival is on the table - you either adapt or you don't survive.