@carolina_carvalho, that’s the spirit 
Please go ahead. The canvas is blank, though @yudhanjaya has the idea that Witness is post-climate change:
If you look out into the ocean on a clear day, sometimes you can see a line of clouds at the horizon, hints of mountain ranges; and looking down into the water from certain parts of the city, you will see the tops of rotting buildings, hinting at the drowned cities below.
A cataclysmic climate change points to a very severe mass extinction, so you might start from there. But it is not too late to question the whole thing. Maybe seal levels only went up a couple of meters, and the ecology is not so different from our own. Have a go! I suggest you start an entirely new topic in the Witnesspedia category, call it “Ecology of Witness” or what not, and have a blast.
This would fit into aethnography. @amelia already pointed out that there should be different lineages of aethnography. We imagined one based on Mauss-Polanyi-Hirschman-Santa Fe Institute, but others are called for, and she has her own ideas. You could imagine one based on Georgescu-Roegen, Prigogine, ecological economics etc. To do this, just reply to that topic. When you have a stub and you are comfortable with others editing it, I will show you how to make any post into a wiki, so that others can edit it too. Works?
This is a very fun idea. Of course, in an ideal world we would have full information on production, inter-distrikt trade, investments and so on. Would you like to start by imagining a measure of the Economic Complexity Index of the various distrikts? This index is based on foreign trade data, which we would have to make up. We already have hints as to the structure of that trade. For example, we know the Covenant to be a strong exporter:
The Assembly restricts foreign trade to reduce its dependency from other Distrikts:
And so on. This, by the way, is a great way to teach yourself the ECI!