Africa's famous grasslands have recently been said to have a great connection to human evolution. Many people think that we walk upright because our ancestors had to walk upright in order to see over the tall grass. Certain people argue that when the savannas came into existence, evolution intensely sped up and caused our ancestors to adapt or die out. A paper in Geology, written by Sarah Feakins at the University of Southern California suggests that our ancestors walking upright to see over the tall grass did not have anything to do with the savannahs. Feakins discovered 12 million year old plant molecules that contained carbon and carbon atoms which come in many different isotopes (variants of a particular chemical element), making it easy to decode their history. Feakins discovered that the grass changed as species adapted to drier weather. The climatic change was the reason people suspected to savnnah of excellerating human evolition. Although, Feakins proves that east Africa was never heavy with tall grass, therefore. it is impossible that our ancestors starting walking upright due to their need to see over the grass. This ecological explination that was created is certainly wrong.
(http://humanorigins.si.edu/research/climate-research/effects)
(http://www.livescience.com/15377-savannas-human-ancestors-evolution.html)
before climatic change
after climatic change
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