Today, the world’s ecological footprint exceeds that of the Earth which means we have to change our lifestyle in order to be sustainable and have enough resources for future generations to usefind more resources at oneclass.comfind more resources at oneclass.com
EESA01Jed BlancaflorWeek 2: The Environmental Consequences of Population GrowthPowerPoint NotesThe IPATS model was developed in 1974 by Paul Ehrlich and John Holdren where the total impact (I) on the environment is a result of the interaction between population (P) (more impact from increasing population, affluence (A) (more impact from consuming more), technology (T) (more impact from faster extraction machines but less impact from faster replacement of resources), and sensitivity (S); the formula is I = P*A*T*SImpact is largely by pollution and resource depletionDoubling time is the number of years it takes, given a specific rate of increase, for a population to double; the formula is 70/(growth rate(decimal)*100)Carrying capacity is the maximum population size of a species that a given environment can sustain; this is influenced by limiting factors such as water, space, food, and disease which affect births and deathsEarth’s carrying capacity ranges between 10 million people living in luxury to 33 billion living in povertyThere are four distinct increases in carrying capacity for humans: the cultural revolution, the agricultural revolution, the industrial revolution, and the medical-technological revolutionThe cultural revolution during the paleolithic period involved the development of tools using stone, bone, and wood for man to eat an omnivorous diet; this revolution also involved the manipulation of fire and the development of speech and communicationThe agricultural revolution 10-12,000 years ago involved the transition from hunters and gatherers to settled farmers manipulating the environment around them to meet needs which reduced the area needed per person, increased population density, created an excess of food, a whole population does not need to be in food production, establishment of settlements, and creation of new social structures such as priests and merchantsThe industrial revolution 3000 years ago involved the transition from rural farming to a manufacturing, urban society which improved sanitation and medicine, advanced agriculture to increase food production, greater supply of energy, resources, and labour, and accumulation of wealth from the selling of manufactured goodsThe medical-technological revolution happening now involves developments in medicine and pharmaceuticals, improved sanitation, global communication, and agricultural advances through the Green Revolution but it allowed people to live longer, healthier lives and the gap between rich and poor is wideningDemography is the study of human population which considers population size, density and distribution, age, sex ratios, birth and death rates, and emigration and immigration ratesEvolution has led to a slight favouring of male offspring so 106 males are born to every 100 females
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- Spring '11
- Tragedy of the Commons, Jed Blancaflor