How does this quote show dehumanization?

“The world’s edges had been clipped by the rising waters, tectonic shifts, and constant rains. Half the population was lost in the disaster and from the disease that spread from too many corpses and not enough graves. The ones that were left were no better off, really. They worked longer hours, they stopped reproducing without the doctors, and worst of all, they stopped dreaming. Families, loved ones, were torn apart in this new world” (Dimaline 28)