Modern humans due to the luck of plate tectonics?

Well it's a theory, and if true, not sure what it means about the prospects of highly intelligent life of our kind on other planets.   From a review in Nature of a book "How the Earth Made Us":

In this age of worldwide climatic deterioration, many authors have documented what we are doing to our planet. Lewis Dartnell turns the tables in his book Origins. He asks how Earth has affected us, through our long evolution to big brains, small jaws and scrawny bodies that somehow cooperate with each other enough to make us the planet’s dominant eukaryotic species. All this began, Dartnell argues, with the tectonic processes that created the East African Rift — the area that today runs from Somalia and Ethiopia down to the coast of Mozambique. The uplift of mountains here caused a rain shadow that dried and warmed East Africa, turned jungle into a park-like savannah, and enticed early hominins to leave the trees and become game hunters, runners, thinkers, cooks and, eventually, empire builders.