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Out of spite by The Infinte Empire as a punishment for a slave uprising by the ancestor race(s) of the Jawas and Sand People, per old lore anyhoo

 Matt Swain wrote:

Voss wrote:

 skyth wrote:

 AegisGrimm wrote:
Exactly, Matt Swain. How about any kind of Single biome planets in sci-fi cinema. I'm going to need some explanation how a desert planet like Tatooine or Dune (Arrakis, if you are a real nerd), or Mustafar could support life. Especially the oxygen breathing kind.

There is an explanation for Tatooine. It used to be a lush planet but then the surface was glassed from orbit. After millennium, the glass broke down and turned to sand.

That more begs the question than provides an explanation.
Its not going to have a viable ecosystem after being 'glassed.'
And no particular reason to resettle it after it slowly upgrades into a desolate sandpit.

Glassed? Deliberately or by natural causes?

"...glassed from orbit..." would tend to imply non-natural causes.

I've taken a look on Wookieepedia - both the "Canon" and Legends tabs indicate the planet did used to be a lush world, with oceans/jungles/etc, but the "Canon" doesn't include an official explanation of how it changed. There is some material in the Legends tab, which looks like it came from a Star Wars comic at some stage.

Just saw "the last jedi" again and we see the stupid "Drawn out execution that keeps good guys alive until miracle happens" bit with Finn and that woman he was with.

You know, a lot of people hated "the wild wild west" movie but you kinda had to hand it to Lovelace when he said "Just shoot him".

Technically I don't think Tatooine is a single biome - it's just that all the action we see takes place in one particular area of the planet (near the pole, high-ish atmospheric humidity, cool enough temperatures at night)

The rest of the planet is much, much hotter.

Arrakis is similar, with the shield wall around Arakeen.