One interesting point is the reducing water consumption is only half the story. Gary Woodard, at the Sahra Center, talks about the "water-energy nexus": "the idea that it takes water to produce energy, and energy to take advantage of water. That is, supplies of water and power are interdependent".

"We may look back at the second half of the last century as an era of cheap food. It'll be like the Hundred Years' War, as we were taught it in school: a seminal moment in human history that's gone and will not return."

In "Tajikistan, where temperatures have risen and glaciers are melting - causing floods, pollution, disease and landslides." All this is also causing political unrest between Tajikistan and Uzbekistan.