Question: Is it possible that we run out of oxygen/air ?

Rebecca Scott answered on 28 Jun 2013:

In general, I’d say no, I don’t think so. But, in some circumstances you could, for example, if you were trapped in a confined space and there was no way for a flow of oxygen to get in, then you would eventually use up all the oxygen. But in general, plants can give out oxygen during photosynthesis which is why it is important not to cut down all the trees.