This question is about the same postapocalyptic future setting as this one, so you might want to refer to it, if you have any questions… about my question:
Okay so this question is an outgrowth from Dronz's answers to my initial question. I am assuming they were correct, as they sound correct.
On a postapocalyptic future Earth, there has been an extremely destructive war between uber-shielded arcology megacities on the Earth's surface and rebelling space colonies that has left the Earth in a state somewhat (though not exactly) similar to the planet Venus today: partially molten crust, very dark, very hot, very wet and high-pressure atmosphere, choked with ash, dust, radioactivity, water vapor from partially boiled-away oceans, very little sunlight getting through, lots of lightning and high winds.
This war was not just a simple nuclear war but also involved lots of other types of super-weapons including antimatter, plasma, nanotech, neutron, microwave, directed-energy, psionic, and spacetime-destroying weapons, to name a few. I am still not sure if any microbes could survive, I know in past mass extinctions some have, and there are types that can survive radiation, or heat, or whatever, but I'm not sure, will any survive this? I'm assuming no, but I'm still open to the possibility of maybe.
So anyway, my question is, how long will the Earth stay in this kind of dark, hot, sunless radioactive soup? Is it possible that a lot of the atmosphere would escape into space after all this damage, like occurred on Mars in the distant past? Because my goal is to ultimately have the postapocalyptic world become a planet of lava plains and wasteland deserts, like the planet Arrakis from Dune, or Tatooine from Star Wars, or Athas from Dark Sun, or Southern California from Fallout, or the Sahara Desert from real life. So, how, in the most realistic and scientifically accurate way possible, do I explain it going from the initial post-war state of radioactive, dark, hot, and wet, to the later mega-desert of still radioactive, but now sun-baked, (still) hot, and (now) dry?