All these three problems, as well as most future problems come from corrupt distribution of resources. 

Once humanity invented agriculture, we set ourselves on a path no different than other creatures who are not nomadic.    Think ants in a steep mountain valley, or a pride of lions stranded on an island.  All resources are eventually consumed and the society collapses.

We have the ability to plan further than the ants so we can compensate for temporary changes in resource abundance.  We can divert water more than ever, but each new diversion has more of the 1% in mind rather than the 99%.    Think data centers in the desert making the BTC holders richer at the cost of next years crops.   Look at all the planned communities going dry world wide because developers did not worry about future water.   Build a few divisions, go bankrupt but the owners still make money.   Repeat as needed.

Nuclear war will not happen because of unequal rights, poverty or honor - the ones in power do not care about such things.   Riots will not lead to nuclear exchanges.  It's going to start somewhere in Asia/Indus over water.