A recent article entitled "Fluctuating Environment May Have Driven Human Evolution
", proceeded to take something that is obvious and attempt to create even more significance from it. It is obvious, that environmental changes [yes, including fluctuations] have driven ALL of evolution, so to even qualify it as "human" indicates some attempt to make the results more significant than they are.
However, the intent of this article in trying to assign relevance was exemplified by this quote:
According to Magill, many anthropologists believe that variability of experience can trigger cognitive development.