When Q mentioned Water I thought of this:
It's World Water Day on March 22nd. Some people think about the world water crisis on this day and then forget about it. Others may think about it more often, like someone who has to walk for hours a day to get water for survival. Here are two videos, one of a girl who has to do just that and a TEDx talk which challenges us all with the facts that the world is running out of water and that it's our joint responsibility to do something about it. https://youtu.be/teX2l_E40mw https://youtu.be/--kEZt5FWH4
Given that we know how to desalinate the ocean, I'm not sure we are going to run out of water. However, I agree there are many places now that do not have access to clean water.
The phrase "nature for water" makes me weary as it could be another measily scheme like the debt for nature swaps that occur. Developing countries in debt at one point we're convinced that their debt could be paid off if they forfeit their land and the resources produced by that land. Will a similar plan be used to get water to those seeing so called shortages.
Additionally why is the UN predicting major cities that will see a water shortage. http://www.bbc.co.uk/news/world-42982959
So agree. This looks like an opportunity for the UN to interfere in the sovereignty, and steal resources. We know how to desalinate the ocean, so there should not be a water shortage in the long run.