industrial revolution, when the modern world began, saw huge increases in production, crop rotation, planting different crops each year , pesticides, chemicals that kill insects on crops, small pox, a disease eradicated by vaccines, cholera, a disease caused by dirty drinking water, 12.1, Ireland's birth rate, 41.3, Mali's birth rate, 6.3, Ireland's death rate, 1.5, Ireland's fertility rate, fertility rate, the average number of babies that a woman will have, birth rate, births per 1000 per year, natural increase, births>deaths, natural decrease, births<deaths, stage 5, stage of the demographic transition model where the population declines, , the demographic transition model, stage 2, stage where the death rate drops for the first time, Sahel, region hit by desertification, overgrazing, a cause of desertification, emigration, people leaving a country, immigration, people coming into a country, migration, people changing where they live, push factors, war, famine, unemployment, pull factors, peace, higher wages, good climate, visas, a barrier to migration, rural depopulation, population falling in the countryside, dependency ratio, the percentage of a population too young or too old to work, Taliban, government of Afghanistan, Human Development Index, the lowest score is 0, the highest score is 1, mean years of schooling, one of the factors used to calculate HDI, Japan, country with the highest life expectancy.

Demographics, migration, development

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