The future of conflict.

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Assuming that religion, nationalistic duty and political ideology are all spent as flash points for major conflict, at least among the general population in the west, what will the major wars of the future of the fought over?
I would assume that should the current over exploitation of natural resources and increasingly hostile atmospheric conditions will cause resource wars at some capacity globally.
Perhaps old grudges will resurface such as in China due to colonialism/empire in the preceding centuries, causing a will for 'revenge'.
I think race wars are done in Europe, but Africa is a tinderbox in that regard due to heavily tribal ethnic groupings, it could happen there if pressure was applied on the system, think Nigeria.
Anyways, I like educated speculation on how the future will be and where the power struggles of the future will lie, and if they will mirror past conflicts or not, and in what ways history may repeat itself in that regard.
Please discuss.