system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If water can be filtered from waste water and turned into potable water, why should we be worried about companies buying freshwater sources?

Like the title says, if we can just keep filtering waste water, why should we be so worried about companies buying sources of freshwater?
gpt
Because water treatment and water desalination is very energy and effort-intensive, so much so that the planet (or even specific freshwater-starved regions) cannot (yet) support a model where freshwater sources are used up haphazardly.