system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why do we not desalinate our ocean water as a viable resource for water?

Seriously, I've been thinking about the major draughts around the world. Our planet is like 2/3 water. Why can't we just use that?
gpt
It's enormously energy intensive, and electricity is expensive. A desalination plant basically requires it's own nuclear core to provide water enough for a small city, and a bigger city like LA would need several plants.

But that isn't going to stop us. We're doing it anyway - in fact, desalination was one of the main reasons Iran insists it needs nuclear energy.