Human Populations

what does the dip in this graph between 1000 and 2000 represent?

black plague

why do developing countries have a higher population than industrialized countries?

• higher birth rates driven by economic needs: child labour

• limited access to family planning and contraception

• cultural values

• high mortality rates → higher births to ensure survival

population pyramids

• bar graphs used to predict countries potential growth

• focus on female pop → reproduction to determine future pop

types of population pyramids

• rapid growth: pop continues to increase due to many females that are at age of reproduction

• slow growth: pop will grow slowly since moderate amount of females who can reproduce

• negative growth: pop will continue to decrease since fewer females to reproduce, lower future pop

what population graph is this?

negative growth

what population graph is this?

rapid growth

what population graph is this?

slow growth

why are population graphs significant

• show trends in birth and death rates

• allow prediction of future population

• can predict and prepare for economic and resource changes

• ex. possible need for retirement infrastructure and more healthcare resources if large senior population

predict what would happen to this population in the future

• future population sizes will decrease

• population should be declining in canada, is not due to immigration

• largest population is seniors, large amount of resources needed

predict what would happen to this population in the future

• population would continue to increase

• rapid growth → many females of reproductive age

predict what would happen to this population in the future

• population would continue to increase

• rapid growth → many females of reproductive age

predict what would happen to this population in the future

• population will decrease since less females of reproductive age

why is child mortality decrease a success?

• decreased due to vaccines

• signifies advances in health and technology

• ensures children survive to adulthood

has the world reached carrying capacity (answer like a test)?

• carrying capacity: the maximum amount of species that an environment can support with available resources over a long period of time

• we have not reached out carrying capacity

• Declining birth rates imply less use of resources

• technological advances such as vaccines allow for longer life expectancy → meaning enough resources available for long lifespan

• however, we are very close to it as seen through

• resources are diminishing: less freshwater, food, land available

• climate change, habitat loss, biodiversity loss

• overconsumption, pollution, not enough available for poor countries

• carrying capacity is dynamic and changing, so we can increase it through medical advancements, renewable energy, etc.