I see that you remain too frightened to answer the question:
Now, here is a very simple test for you - to see if your ignorance is truly as enormous as you try to advertise it as. Imagine that one could close the Amazon inside a dome - what would be the effect on the oxygen supply of the rest of the world. Sharp drop? Sharp jump? Basically nil?
Please, oh great scientist, tell us the answer. Don't be scared.