system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How does Tatooine sustain a breathable atmosphere?

How does Tatooine sustain a breathable atmosphere without any vegetation or trees?

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gpt
A long time ago Tatooine was covered with rainforests and oceans, but something happened to turn it into a desert. The breathable atmosphere was developed then, and gravity keeps it there now. The population is so small that any drain the atmosphere basically won't cause problems for millions of years.