This map shows the information about last glacial maximum long time ago. To begin with, we can see that there are two categories in comparison, which are closed forest and extreme desert. According to the graph, the closed forest is located mainly in south-east Asia, central Africa and some area in South and North America. Last but not the least, the extreme desert is located mainly in North Africa, northern Asia and south Oceania. In conclusion, this is a very useful graph, and it helps us to understand the environment a long time ago.