Most survivors of that progress trap became farmers — a largely unconscious revolution during which all the staple foods we eat today were developed from wild roots and seeds (yes, all: no new staples have been produced from scratch since prehistoric times). Farming brought dense human populations and centralized control, the defining ingredients of full-blown civilization for the last five thousand years.
As per the last comment above, Tel Aviv researchers surmise that the progressive extirpation of all the large prey fauna over the course of 1.5 million years forced society in the Southern Levant to innovate agriculture as a means of survival. Our early ancestors did not have accurate records that could reveal the trend of resource depletion so continued short term resource depletion in each of their respective lifetimes.