[tolbiny]

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8mya primates spread across the globe- they were highly successful, largly because of oppasble thumbs (and in some cases big toes as well). Very adaptable creatures were all over Europe, africa, asia, south america, north america. All over the place. The climate waas perfect for them- tropical jungles all around. Then the climate changed as it was want to do, and vast tracks of the forests died off, and food became scare in a lot of areas.
The vast majority of male apes don't help with child rearing at all, male chimps don't even know which kid is theirs. The apes that could survive in the low food environment were the ones where both the male and female provided for their young. This is the beginning of monogomy in humans. Primates already had opposable thumbs which helped them to carry food, but the males who were the best providers were the ones who could walk upright further than the others, using their hands to carry more food at a time, and having to make fewer trips.

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This is not a stretch? For so many reasons?

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1- there is evidence of a massive spread of primates ~8 mill years ago (it starts around 16 miilion years ago)
2- there is evidence of a severe decline in the total numbers of primates and primate species around 6 mya.
3- there is evidence of signifigant climate change - esp in the east african rift system where the earliest hominid specimeins are found.
4- the fossil evidence of humans shows that bipedality comes first, before large brains, before the femoral/humeral index of modern humans, bofre changes in dentition.