Lyric discussion by Occams_Harmony 

The current world as we know it is not perfect for human life. In many ways, it's hostile as hell to human life. The song is about humanity struggling to build a better world against the odds, struggling against the raw elements of the universe to build a world where all people can be happy and live a good life. Only humanity can do this, and we've got to try.

Build a world for humans, by humans.

Of course, it must be an environmentally sustainable world, but humanity currently lives on a hostile planet. Only science gives us the ability to live in many of the places which would otherwise kill us.

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