Tsinghua University does it again: their reputation for skilled engineers is often inflated, but perhaps in this case not undeserved (page 32).
The implications: pipe seawater through fuel cells - especially if it was combined into an algae bioreactor to produce biodegradeable matter - and you produce both power and desalinised water. This was something I found when searching for a mechanism by which seawater could be used for algae bioreactors and then provide water for use in African agriculture. This could create power, biodiesel, and clean water to bring life back to the overly arid lands now unavailable for cultivation.
Throw a little urine in there for nitrogen, and you have an indigenous source of ammonia fertiliser. Full of win.
The Green Gap
In the Cold War, we feared a Missile Gap was a strategic weakness. Nowadays, we must awaken to the fact that the Green Gap is true strategic weakness: the nations whose economies will thrive in the coming years will not be those with the biggest factories, but those with the most sustainable, efficient, and ecological markets. What we require is a Strategic "Green Reserve" of ecological design to weather the coming changes that both climate and resource scarcity will force on the international economy.