There was a movie once called 'Silent Running' (I think). It was about a ship that held that last of the Earths wildlife in pods that were transperent on the top to let sunlight in. Earth by then was nothing but one big city.
One day an order came through from Earth for the crews of these ships to destroy the pods and come home. One guy however, wanted to continue to preserve the last of the wildlife...but the rest of his crewmates only cared about going home. In the end he ended up killing the rest of his crewmates and took control of the ship, by then all but one of the pods have been destroyed.
Knowing he was being persued this guy went on the run. But soon he realized that the further he got from the sun...the more the plantlife wilted and started to die. As a last resort, he set up an array of artifical lights to keep the plantlife alive and set a small robot to the task of maintaining it. He then ejected the pod...sending it out and away from those that would want to destroy it...and destroyed the ship..himself along with it.
Now...if we do not stop now...this may very well happen. Do we really want the Earth to become nothing but concrete and steel? I don't...I think wildlife is much prettier...
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