Hello I have a theoretical question. I’m writing a paper and I’m dealing with a hypothetical scenario. Let’s say that the global oxygen level in the air dipped to 10% worldwide. I would assume that this would be enough to impair normal biological function for most humans. Now in this given scenario, I would like to know a few things. Firstly even though regular fires would be unable to start, would smouldering fires continue to burn? And would the glowing light from the smouldering embers be visible to people? Secondly I would like to know if a person living in this environment would be able to briefly start a fire by blowing on the embers or a material that could be ignited. Thank you, any help is appreciated.