I = PAT that human population may stabilize at around 11.2 billion in 2100, the I=PAT equation will continue to be relevant for the increasing human impact on the environment in the short to mid-term future. Increased population increases humans' environmental impact in many ways, which include but are not limited to: The variable A, in the I=PAT equation stands for affluence. It represents the average consumption of each person in the population. As the consumption of each person increases, the total environmental impact increases as well. A common proxy for measuring consumption is through GDP per capita. While GDP per capita measures
Population ecology 01: N = N N = N + B + I - D - E Assumption 02: There is no migration to or from the population (N) I = E = 0 N = N + B - D The raw birth and death rates are related to the per capita birth and death rates: B = b × N D = d × N b = B / N d = D / N Therefore: N = N + (b × N) - (d × N) Assumption 03: b and d are constant (i.e. they don't change each generation).