Other films like Silent Running

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I don't know what film, Avenger69 and qed100, were watching but I saw this movie when it was first release, and though I was a kid at the time I understood that indeed some kind of disaster had occurred on the earth, otherwise why would humanity use huge amounts of its limited resources to ship the last forests out in to space; Because they can no longer survive on the Earth’s surface. And not once did I hear anyone in the story mentioned that some kind of human utopia exist on earth; i.e. no more poverty, no more war, no more racial prejudice, no more pestilence, starvation or misery of any kind. And as for planet Earth's temperature, Bruce Dern’s character was referring to the global mean temperature, which at the time the film came out was about 68 degrees, i.e. room temperature. Now for the nonscientists out there the global mean temperature is very important to the stability of the earth’s biosphere because as we are now witnessing in the present-day global warming if the global mean temperature gets a few degrees warmer or colder the planet can slip into either an Ice Age or a runaway greenhouse effect. Therefore when Bruce Dern’s character mentions that the global mean temperature has jumped to about 74 degrees, well let's just say that what people were worried about happening back then has home to roost.