Climate Records and Mammal Structure (IMAGE) Arizona State University Caption Temperature, vegetation and human population growth changes over the last 22,000 years. The cool and arid Last Glacial Maximum saw the expansion of desert environments at the expense of forests, whereas the warm and wet mid-Holocene was characterized by an expansion of savannas and forests. These environmental changes greatly influenced the distribution of African mammal communities. The Intergovernmental Panel on Climate Change (IPCC) projects up to 4°C increase by 2100 and the United Nations (UN) projects human population growth to exceed 11 million people by then. Credit Modified with permission from Railsbeck's "Fundamentals of Quaternary Science" http://www.gly.uga.edu/railsback/FQS/FQS.html Usage Restrictions For use in conjunction with the distribution of this research only. 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.