How would the world look like if the australopethicus or another previous human ancestor never existed? If the most intelligent lifeform was only the chimpanzee?
How would the environment be? Would Europe's flora and fauna look like? Like in 40000 BC? Like in 1000000 BC before the first Homo erectus appeared? How would the rest of the world Asia's, America's environment look like?
How would Africa's flora and fauna look like without hominins?

Maybe I should post it on /an/?