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There was a mass extinction 12,000 years ago and a repeated bottleneck on that same 12,000 year cycle. Some think it is because of our Sun, the cycle of micro novas and cosmic rays. We are due again.

Carrying capacity has increased with technology. Mass extinctions wipe out more than life. Do you ever wonder how ancient megaliths were built ubiquitously around the globe? It would have taken highly evolved cultures, organization and technology. POOF! Gone. Everything, but the stone structures.

Just something to consider.

Do you know mitochondria is only about 100,000 years old?

I guess the humans 2.3 million years ago didn’t have mitochondria. Maybe they had pre-mitochondria.