Presentation on theme: "3.2 A Growing Population Geography. Journal Entry 9/25/2007 Imagine that you are a naturalist observing animals in the wild. Write a paragraph of."— Presentation transcript:
Journal Entry 9/25/2007 Imagine that you are a naturalist observing animals in the wild. Write a paragraph of field notes describing a very active chimpanzee. Use as many words that contain or end in the consonant cluster mp as you can. (Possible words include: bump, chimp, chomp, clump, jump, ramp, romp, scamp, scamper, stamp, stomp, thump, tramp, trample, etc.)
How do demographers figure out population growth? Population growth is worldwide During different historical periods, populations grew t different rates Demographers know that population growth depends on the birthrate and the death rate. The birthrate is the number of live births each year pr 1,000 people. The death rate is the number of deaths each year per 1, 000 people By comparing birthrates and death rates, demographers can figure out population growth.
Trace the reasons that population grew slowly. For centuries the world population grew slowly Farmers worked without modern machinery Food supplies often were scarce Thousands died of diseases Although the birthrate was high, so was the death rate Life expectancy (the average number of years that people live) was short.
Trace the reasons for today’s population growth. Reasons for population growth today Birthrate has increased dramatically Death rate has slowed Populations in most countries have grown very fast People live longer than ever ( 100 years ago avg. US men and women lived less than 50 years. The average now is 80).
Trace the ways that science has improved life expectancy scientific developments have made this longer life span possible New farming methods have greatly increased the world’s food supply New varieties of important food crops New ways to protect crops against insects New ways to raise crops with less water
Trace how medicine has improved life expectancy Other scientific advancements came in medicine Vaccines to fight diseases Many babies are born and stay health
Explain why people in Africa and Asia do not have enough food. Challenges of Population Growth Growing populations use resources faster than stable populations People in Southwest Asia face shortages of fresh water and energy. People in Africa and Asia face food shortages Often these countries do not have enough money to import food.
Evaluate why countries feel the pressure of population growth Population growth puts pressure on all aspects of life Lack of employment Not enough schools to educate the growing number of children (in NC Chatham and Wake Counties) Housing is scarce and expensive Transportation and sanitation are inadequate
Evaluate why population growth is so visible in South Asia. Problems created by rapid population growth are most visible in South Asia. Home to ¼ of the world’s population Home to about ¼ of the world’s poor ¼ of the children born will die before their first birthday
Describe how the environment is impacted by population growth Rapid population growth also affects the environment Forests in areas of India and Pakistan are disappearing People cut the trees to sue the wood for building and for fuel Cutting forests affects the supply of clean air. Before tree roots held soil in place, now heavy rainfall may wash away soil