Do you think the world is overpopulated? Why or why not?

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Presentation transcript:

Do you think the world is overpopulated? Why or why not?

Overpopulation QyaYchttp:// QyaYc

Population Growth It took until the year 1850 for the world to reach one billion people.

How much is one billion? The population of Houston is 2.1 million. Metropolitan Houston is almost 6 million. If you had a million dollars in thousand dollar bills, it would be 4.3 inches tall. If you had a billion dollars in thousand dollar bills, it would be 358 feet tall! (~35 stories tall)

How much is one billion? It took you 11.6 days to be alive for a million seconds. It will take you 31.7 years to live for a billion seconds.

Population Growth In 2011, the population of the world reached 7 billion!

China and India China and India are both over 1 billion people. China= 1.3 billion India= 1.2 billion India is growing faster than China. They should catch up by 2050.

Population

Population Density People live on only ~10% of the Earth’s surface. Why?

Most live in East or South Asia, Europe, and the Northeastern USA.

Why do people live in particular areas? Moderate climates People prefer to live in places not too hot or not too cold.

Why do people live in particular areas? Close to water

Why do people live in particular areas? Proximity People stay close to where they came from

Why do people live in particular areas? The Industrial Revolution (18 th and 19 th c.) Caused a population shift as people moved from rural to urban areas.

Urbanization The dramatic rise in the number of cities and the changes in lifestyle that result. There are now more people in cities than in rural areas.

Demographic Statistics Population density The number of people living in a given area. U.S. = 83 per sq. mi. Bangladesh= 2,559 per sq. mi.

Manner in which population has grown historically. DEMOGRAPHIC TRANSITION MODEL (DTM)

Stage 1: Slow Growth Population grew very slowly. Many children born, but also many die. Most people are farmers. Growth pattern until the 1700s.

Stage II - Rapid Population growth in MDC’s late 18 th and early 19 th centuries. Population exploded due to the confluence of the Industrial, Medical, and Agricultural Revolutions. People leave the farms (fewer jobs) for the new jobs in the factories of the cities.

Stage 2: Rapid Growth: LDC Hygiene and medical technology increases. Medical care diffused from MDC’s. Why is that a problem?

Does the developed world have a moral obligation to solve population related issues around the world?

Stage 3: Slow Growth or No Growth: MDC Population begins to level off. People have less kids as they become wealthier. Kids are no longer an asset. Immigration is often the only reason they see any growth. The U.S. is in Stage 3

Reasons behind birth and death rate falling: Family planning available Lower Infant Mortality Rate Increased mechanization reduces need for workers Increased standard of living Changing status of women

Stage 4: Negative Growth: MDC More people are dying than are being born. Incentives may Be given for more children. Abortion Often illegal. Japan and most of Europe are in Stage 4

Overpopulation Carrying capacity the number of people a region can support with minimal negative effects reached when resources available can no longer support the population.

Carrying Capacity Which has a larger carrying capacity?

Consumption of the World’s Resources

How do we avoid exceeding our carrying capacity?

Dry land farming Technology – center pivot irrigation

Technology!

World Clock ock/ ock/

4 Minute History of the World YSojohttp:// YSojo