In fact, production on Blue Planet was underway well before Waterworld was even released. There are two other influences worth mentioning. Also, there is a computer game by MicroProse called Subwar 2050 . I have to admit, I was playing an awful lot of Subwar as I developed the basic premise for Blue Planet . I am not sure if that is a fair description or not.
Cyberpunk traditionally focuses on settings where there is little hope beyond individual survival.
This is not true in Blue Planet . In fact it is just the opposite. Poseidon represents hope and freedom and there is a distinct lack of control by the powers that be. Individuals can make a difference and fighting to change the system is one of the major themes in the Blue Planet backstory. It is an excellent motivator as many players have strong opinions about environmental issues.