Population Notes

Population

What is Population?

• Population refers to the number of people living in a specific area.

Population Change Over Time

• 200,000 years ago: $170 \text{ million}$ humans
• 2,000 years ago: $900 \text{ million}$ humans
• 200 years ago: Over $7 \text{ billion}$ humans

Why Population Rises

• Population increases because the birth rate exceeds the death rate.
• Natural Increase = Birth Rate - Death Rate

Population Equation

• If births + immigration > deaths + emigration, then population increases.
• If births + immigration < deaths + emigration, then population decreases.

Population Density

• Population density varies across the world.
• Red areas on a population density map indicate densely populated regions.
• White areas indicate sparsely populated regions.

True Statements about Population Distribution:

• People are not spread out evenly over the world.
• Some places are more crowded than others.
• Asia is the most densely populated continent.
• Greenland, Australia, and northern Canada are all sparsely populated.
• Europe is a densely populated continent.