Comment by accidentallfact

I think a quite unexpected (but more common sense) picture begins to emerge:

1. Language already emerged with early hominins (paranthropus and such).

2. Habilis et al developed toolmaking to a level that carrying stuff around was of critical importance.

3. H. erectus emerged from walking, and brought technology to a "civilized" level.

4. Anything post erectus evolved for civilized society.

5. The destruction of soils in eurasia about 24000 BC

6. The destruction of soils in the Americas about 9500 BC

7. Old metallurgy age.

8. Tin bronze age.

9. Recorded history.