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The four functions of AGIL break into external and internal problems, and further into instrumental and consummatory problems. External problems include the use of natural resources and making decisions to achieve goals, whereas keeping the community integrated and maintaining the common values and practices over succeeding generations are considered internal problems.
Human history or world history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers.
Estimates of world population by their nature are an aspect of modernity, possible only since the Age of Discovery.Early estimates for the population of the world [10] date to the 17th century: William Petty, in 1682, estimated the world population at 320 million (current estimates ranging close to twice this number); by the late 18th century, estimates ranged close to one billion (consistent ...