I never really understood this question. There have been dozens of wars fought since WWII - and that is just ones that the USA has been involved, at least 30 I think. All wars are essentially about resources, since land is a resource.

So we are not exactly looking at a new trend here.

I would suggest that the potential scale of these particular shortages, coupled with the increase in human population over the last 60 years (since the end of WWII) might give one pause to consider whether any resultant resource war might be a wee bit larger than past ones.