Mad Max Fury Road. They defeat the tyrant, and get the control of the water valves. Then they open the valves and seemingly keep them open. One problem, how long is the water reservoir gonna last now?
Logan’s Run. The city dwellers are freed from the computer’s iron-fisted rule, and Carrousel. But their city is in ruins, and thinks to the computer providing everything. They don’t know how to live without it. The city dwellers are going to start dying off real fast.
Children of Men.
It’s implied that these scientists can cure the infertility crisis, but the best case scenario is the mother and baby are going to be experimented on invasively.
Worst case scenario is the mother, and all future offspring turn into full time baby-makers.