bio 122 final ecology section

pre industrial

birth rate is equal to death rate, there is no growth in population

industrial

birth rate is greater than death rate, increase in population

post industrial

equal birth and death rates LOW no change

what happens to countries as they go through a demographic transition

they experience a shift in birth and death rates, which changes the population size and structure

what is population aging

what impact does it have on the future growth and economy of countries

portion of human population is old, it causes the young population to decrease, with fewer young people the economy suffers which makes health are higher

what two issues impact whether the global human population size over the next 50 years will stabilize at a sustainable size

how can these two issues be addressed

1. birth rates in developing countries

• family planning

• education of woman

2. consumption rates in developing countries

• reduce use of products

describe the impact of the elimination of top predators on the community in the forrest of the eastern united states

there will be more deer, which will decrease the amount of trees in the population, and increase the amount of ticks, ticks spread diseases such as lyme disease that will hurt the population

explain why a region would be able to support a larger population composed of people with a vegetarian diet than a population composed of people with a high proportion of meat in their diet in the same region

a vegetation diet is much more sustainable than a meat diet, it requires less land usage and has less of an environmental impact, and humans can obtain energy directly from the primary producer

explain why rising global temperatures will impact the water cycle and increase the frequency of these extreme storm events

warmer temperatures will increase evaporation and lead to more moisture in the atmosphere which fuels storms and leads to extreme weather

briefly explain how humans have altered the carbon cycle resulting in rising carbon dioxide concentrations in the atmosphere

burning fossil fuels which has increased the CO2 amount in the air, deforestation which takes away trees that are used to produce oxygen and get rid of Co2, industrialization which puts CO2 into the air

briefly explain why CO2 concentration in the atmosphere and the greenhouse effect influences global temperature

increase in CO2 and other greenhouse gasses enhance greenhouse effect trapping more heat and causing a rise in global temperatures as the planet warms more water evaporates feeding into the cycle and amplifying warm effect

describe an example of how global climate change will impact human health and/or well being

air quality- rising temperatures and altered weather patterns can worsen air quality leading to respiratory problems and asthma