Key Issue Number Two

Where Has The World's Population Increased?

• We are concerned with society as a whole rather than individuals or groups. We look at crude rates.
• Crude Birth Rate (CBR) - the total number of live births in a year for one thousand people alive in society.
• Crude Death Rate (CDR) - the total number of deaths in a year for every one thousand people alive in society.

• Below is a link to an extra chat about world birth rates and death rates.
• http://www.infoplease.com/ipa/A0004395.html

• Natural Increase
• Also known as NIR.
• The percentage by which a population grows in a year.
• The NIR affects the doubling time.
• The number of years needed to double a population, assuming a constant rate of natural increase.
• Fertility
• Also known as the Total Fertility Rate (TFR).
• The average number of children a woman will have throughout her childbearing years.
• Life Expectancy
• The average number of years a newborn infant can expect to live at current mortality levels.