How did agriculture change early human civilizations?

Definition and Explanation

Agriculture is the practice of cultivating plants and domesticating animals for food, fiber, and other products. The development of agriculture, known as the Neolithic Revolution (around 10,000 BCE), marked a major turning point in human history. Before agriculture, humans were primarily hunter-gatherers, moving frequently to find food. With agriculture, people could produce surplus food, settle in one place, and form larger, more complex societies.

Key changes brought by agriculture:

• Permanent settlements
• Population growth
• Division of labor and social hierarchies
• Development of new technologies (e.g., plows, irrigation)

Worked Example: Population Growth

Suppose a hunter-gatherer group can support 1 person per 10 square kilometers, while an agricultural society can support 10 people per 1 square kilometer.

Let's compare the population density:

• Hunter-gatherers:

$$ \text{Density}_{HG} = \frac{1 \text{ person}}{10 \text{ km}^2} = 0.1 \text{ persons/km}^2 $$

• Agricultural society:

$$ \text{Density}_{Ag} = \frac{10 \text{ persons}}{1 \text{ km}^2} = 10 \text{ persons/km}^2 $$

Ratio of densities:
$$ \text{Increase factor} = \frac{\text{Density}_{Ag}}{\text{Density}_{HG}} = \frac{10}{0.1} = 100 $$

This means agriculture could support populations up to 100 times denser than hunting and gathering.

Takeaways

• Agriculture enabled permanent settlements and population growth.
• Surplus food led to social complexity, new jobs, and technological innovation.
• The shift from hunting-gathering to farming fundamentally transformed early human societies.