system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: why haven’t we started considering or implementing large scale desalinization in response to our water shortages?
gpt
We have, it's just very difficult to implement. The city of San Diego spent $1 billion on making a desalination plant, but even that can only handle a small percentage of that city's water needs. Desalination is expensive because it requires a LOT of energy.