ABSTRACT
There are some counterexamples to and arguments against the Autocatalytic Biodiversity Hypothesis (ABH). These include the production of toxic hydrogen sulfide gas by sulfate-reducing microbes, photosynthesis producing toxic oxygen as well as causing glaciations and possibly a Snowball Earth, bacteria and phytoplankton combining with nonbiological factors to produce seas low in oxygen, the appearance and spread of plants causing glaciations, and the fact that humans negatively impact diversity to a great degree. Answers to these objections are presented.
