Consequently, the Asian monsoon region is occupied by about 40 per cent of the world’s population. Inhabitants are supported by a rich productive infrastructure, enabling them to live full lives in a limited area where they have created diverse cultures, peoples and languages. Linguistic diversity is high in the Asian monsoon region (South India, Southeast Asia, Southern China), linguistic diversity is likewise established in Central Africa and Central America, where the growing seasons are long and rainfall is plentiful (Nettle, 1999). In monsoon Asia, there are many mountains and islands where adequate food supplies can be guaranteed, so there is no need to make strenuous efforts to expand one’s territory, a fact that promotes seclusion, preventing expansionist ideas from spreading horizontally, and directing people’s attention to enriching their lives in their homelands, developing richly diverse nationalities and cultures. The most unique feature of this region is that, from the tropical area near the Tropic of Capricorn to latitude 60° North in the Arctic zone, there is a continuous moist climate and fertile soil.