Anon, there are approximately 390 billion trees in the Amazon rainforest. These trees vary widely in species and size. The chemical reactions that occur in these trees in order to produce organic compounds and oxygen from carbon dioxide are complex and require a constant supply of energy to be generated by the plant. One of these 390 billion trees works hard to replace the oxygen that you breathe. Anon, I want you to find this tree deep in the Amazon rainforest and apolagise to it for wasting the oxygen it works so hard to produce.