150 likes | 436 Views
CONCEPTS OF POPULATION. Demography. POPULATION GEOGRAPHY. GEOGRAPHIC ANALYSIS OF POPULATION - Distribution. 90% live in northern hemisphere - 2/3 located 300 miles to ocean ½ live on 5% of the land on Earth. Dot Map. GEOGRAPHIC ANALYSIS OF POPULATION - Scale. SMALL scale OR
E N D
GEOGRAPHIC ANALYSIS OF POPULATION- Distribution • 90% live in northern hemisphere - 2/3 located 300 miles to ocean • ½ live on 5% of the land on Earth
GEOGRAPHIC ANALYSIS OF POPULATION- Scale • SMALL scale OR • Medium scale?
ARITHMETIC DENSITY Total # of people / by total land area USA 300 million people 9 million sq kilometers of land space Arithmetic density = 33 people per sq Km
Measures the pressure people place on land to produce enough food. Divides the pop by the sq km of arable land Arithmetic density PPD Egypt: 74 3,500 90% of Egyptians live in the Nile Delta and live in 5% of the country's territory - 44% in urban areas and most in some 4,000 villages. Physiologic Population Density
CARRYING CAPACITY • The number of individuals who can be supported in a given area within natural resource limits, and without degrading the natural social, cultural and economic environment for present and future generations. • The carrying capacity for any given area is not fixed. It can be altered by improved technology, but mostly it is changed for the worse by pressures which accompany a population increase. • As the environment is degraded, carrying capacity actually shrinks, leaving the environment no longer able to support even the number of people who could formerly have lived in the area on a sustainable basis.
China food production will decline by 37% by the late 21st century China's population will to 1.5 billion by 2050 placing a strain on the entire carrying capacity of the world. reduction in agricultural capability in China (as in other world regions) is largely due to the world Water crisis CARRYING CAPACITY