The answers may explain why humans lost their fur in hot places like Africa but doesn't explain why they didn't grow it back again once they reached the Arctic. Most mammals have either thick fur of lots of blubber. Humans have neither. Without clothes they'd die of hypothermia.
And Ruby has a point.. that article of Cofty's is full of.. 'our model' 'we suggest' 'maybe' 'we postulate' 'a good case can be made' 'our revised model' 'we believe' 'we assume' .... they are not actually saying that these are all facts, they are 'assuming', 'predicting', conducting an experiment.
Sounds a bit like WTs 'evidently'.