Who makes up a population improvements to health care, allows people to live longer, fertility treatments. Population density globally (map in powerpoint) most dense have over 400 people/km2 also places without liveable land within a nation notion of scale, depends on the level you look at something, the information changes (map in powerpoint) Population composition gender, age, employment, migrant status population pyramids, age and gender traditionally they would be the shape of pyramids change of the age pyramid means that the social climate is changing. Dependency ratio babies and old babies for the workers, 20 to 64 to take care of dependency ratio in canada will rise because of the old baby boomers. Total fertility rate focuses on women, how many children is a woman expected to have over her life time? cohort specific teen pregnancy is exploding total 1. 5 in canada, afghanistan 6. 8. Doubling time how long to double, whole world is about 40 years.