In Earth's history,what might the cooling of the Earth and the resulting change from a forested to a grassy landscape have made adaptive in humans?

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The cooling of the Earth and the resulting change from a forested to a grassy landscape may have made bipedalism adaptive in humans. Bipedalism allowed early humans to move more efficiently across the open grasslands in search of food and resources. This adaptation also freed up their hands to carry tools and weapons, which aided in their survival and success as a species. While social structure and complex language also played important roles in human evolution, they were not necessarily directly linked to the cooling of the Earth and the shift to a grassy landscape. Grasping fingers were already present in early primates, and were not necessarily a result of this specific environmental change.

In Earth's History,what Might the Cooling of the Earth and the Resulting