Of course, the same period also coincides with our ancestors coming down from the trees (probably as a result of climatic change in Africa) .... so maybe the uplift of the Tibetan Plateau is directly responsible for homo sapien!
"Major tectonic changes on the Tibetan Plateau may have caused it to attain its towering present-day elevations -- rendering it inhospitable to the plants and animals that once thrived there -- as recently as 2-3 million years ago, not millions of years earlier than that, as geologists have generally believed. The new evidence calls into question the validity of methods commonly used by scientists to reconstruct the past elevations of the region."