Intelligence differentiates man from other species. However, it was not the appearance of intelligence that led to the takeoff of the human population.
During the Neolithic Revolution is when man becomes a farmer, only 11,000 years ago. Previously, during the Paleolithic, 99% of the period of existence of the human being, the human population on the planet is estimated to be 10 million people .
Plants are the basis of living ecosystems. Also, in the case of humans, since Neolithic Revolution, most relevant global social progress has continued being linked directly or indirecty to agriculture.