Dear Phyisics Forum, I registered here in hope to find some help as I plan a videogame and really have to solve some "small" idea I have. More likely a way how to explain it. In basic I want to explain how a Nuclear Explosion ("regular" Nuke with uranium, i guess) can cause a chain reaction that the whole Air, if not even atmosphere catches fire and burns up. And before replies come with the Nitrogen and Oxygen etc. "My Earth" has another scenario... So read on before creating an answer: 1. The earth is covered in a Virus (micro-biological organism?) AND / OR Gas, not sure yet if it's both or either... But most likely both 2. The virus (if chosen) has even manipulated plants that they produce no more Oxygen but more poisonous gas / toxin (does that even sound realistic, because that is also one of my basic ideas, also they only live from water and sun) 3. My idea is that the EXTREME HIGH temperature of the nuclear explosion would cause the virus (organism) and / or the gas to a chain reaction that it would burn the whole planet surface down and / or atmosphere, while everything under the surface (earth and water) stays safe, though the atmosphere would be gone and living as we know it would be impossible. 4. I look for ANY idea that sounds plausible enough how this could happen, e.g. a gas that only burns in extreme high temperatures (thousands of degrees celsius) or if it sounds logical enough that the virus (organism) would burn all over the earth and since it infested the whole world and covered everything due being in the toxin / gas that is produced by the plants, everything else would burn along too. 5. If you have other clues which are not based on my scenario, please let me know under which conditions the Atmosphere could be erased (still with the nuclear weapon being the trigger of the event) If you need any more information of what I have in mind or you do not understand something of what I formulated here please let me know in a reply in this forum and I will do my best to clear some things up. Also I thank you all for reading and replying in advance!