Birthplace (IMAGE) Columbia Climate School Caption Humans are believed to have evolved in east Africa, as the landscape changed from forest to grassland. Here, children cross the Turkwel River in northern Kenya, where many key fossils have been found. Credit Kevin Krajick/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.