Their biggest problem Delta will be us (the have's) will we invade them for their food water & other resources when ours get scarce? Enslave them & force them to produce for us? History says yes in a heartbeat, that the have's will take by force from the have nots. I don't see PO happening with the new tech being rolled out to get at more oil, I do see us using or fouling most/all of our fresh water in the quest for oil & then having to invade to survive/continue to thrive. After all without fresh water we wont grow much in North America, no longer the bread basket. Think of us in the future as being saharan Africa now, just with the ability to invade at will for what we don't have but want/need.