sentences:  Mount Kenya was an active volcano in the Pliocene, 2.5-5 million years ago (mya).5 mya the Mediterranean Sea was dry and the dunes of the Sahara were much further south; the area that is now Kenya was an arid savanna.By 3.7 mya the climate was much wetter than it is at present, and the broad pattern of vegetation in East Africa established, although there would still be much variation in species and altitudinal distribution due to climatic oscillations.