There are 3 popular time travel theories in sci-fi movies: Fixed timeline (what you change in the past does not really matter, it was predetermined and everything will fall into place equally); Dynamic timeline (any change in the past will drastically affect and modify the present), and parallel timelines: any change in the past will create an alternative timeline, kind of a separate universe. This movie does not explain which one it is, but it heavily implies the last: Present humans are fighting in the future to save their childrens's timeline, but their own is already different with the knowledge that aliens will arrive at some point. If it was a dynamic timeline the 'future' would change with every single interaction or jump between present and future.

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