This map shows the information about the distribution of closed forests and extreme desert all over the world. To begin with, we can see that there are several sections in this map, that is, last glacial maximum 18000 years ago, early Holocene 8000 years ago, and present potential vegetation. According to the graph, there are two colours— green indicating closed forest while yellow indicating extreme desert. In the early Holocene, only some areas in Asia are covered by the yellow color. Last but not the least, in Last glacial maximum, the majority of Australia is covered by extreme desert. In conclusion, I think this is a very useful graph, and it helps to understand the distribution of closed forests and extreme desert all over the world.