By the twenty-first century, more people will be descendants of the non-Western groups t

hat anthropologists have traditionally studied. Its easy to see that solutions for future problems will depend 【M1】______ increasingly on understanding non-Western cultural background. The Southern Hemisphere is steadily increasing their share of world population, and the 【M2】______ fastest population growth rates are in Third World cities. Rural migrants move to slums, where they live in hovels that lack utilities and public sanitation facilities. Growing with 12 to 20 percent each year, the world 【M3】______ slum population will double in three to six years. If current demographic trends continue, urban population increase and the concentration of city dwellers in slums will be accompanied by increased rates of crime and 【M4】______ water, air, and noise pollution. These problems will be most severe in the less-developed countries. Therefore, 【M5】______ they will also affect the United States, which shares a front with Mexico, one of the worlds fastest growing 【M6】______ nations. As a result of petroleum — and chemical — dependent mechanized farming, the global food supply increased dramatically from the 1950s through the mid-1980s. Now, moreover, food production and food distribution 【M7】______ are not keeping up with world population growth. The gap will surely widen up if current trends continue. 【M8】______ Children will go on dying as starvation substitutes for more human means of limiting population growth. 【M9】______ Todays African famine areas provide a glimpse of things to come. From the global perspective, birth control and family planning are essential if resources are to be sufficient, if starvation, pestilence, and war are 【M10】______ not to stalk the earth during the third millennia.

【M1】