Third's assignment main idea

Sustainable machine.
The main Idea for this third assignment is creating an environment where you can actually see and feel how the humanity is polluting the cities, and how gray and contaminated have become.
After putting that in evidence, I want to build some sort of futuristic machine on which you can actually see how a leaf, enters, and turns into water after a few movements of the machine.
In some sort of way, I want to propose one hypothetical alternative to the problem of lack of water which the humanity is confronting.
I’m going to try to create a very abstract model, but still, that people can be able to understand all the ideas, and also try to leave the viewer something to think about.
I’m aware that what my proposal it isn’t even close to reality but still I’m not trying to come with a solution, I’m just trying to make conscience.