The age old question of "are we alone in the universe?" sparks interesting debates, theories, and discussions. Does life exist on other planets? Is it intelligent? Is it more advanced than us? Have they destroyed their ecosystem like we are in the process of doing and looking for other planets where they can start over?
That latter question is one that has popped up in various science fiction movies, and for good reason. The ecological movement of the 70s resulted in the EPA and big steps towards reducing and cleaning up pollution. Nowadays, the altering of our climate via pollution (greenhouse gasses) has become so politicized that even good science has been demonized and sacrificed upon the altar of political posturing.
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