(Flickr/surfergirl1972) What happens 100 years from now when, if climate change has brought us to a point where water has become one of our scarcest resources, and more precious than oil or gold? We’ve asked fiction writers to imagine the Great Lakes region a century or more on, and help us paint an audio portrait of that world. Local author Nnedi Okorafor starts out the series on Chicago’s south side. In her story, “Poison Fish” (or, “Poison Poisson”), Okorafor brings us to a dystopian backdrop of memories and chaos, set along the waterfront on Chicago’s south side.