system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do Third World Countries have problems with possessing water, when the earth is 79% of it and we have the technology to purify water?
gpt
It's not purification, it's desalination (taking the salt out of the water). And it's a very expensive process which requires a lot of energy. And even after you do that, you still need to deliver this water somehow - most places that suffer from a lack of water simply don't have the proper water delivery infrastructure.