ENV100Y5 Lecture Notes - Lecture 22: Doubling Time, Global Hectare, Earth Overshoot Day

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2 Feb 2017
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ENV100Y5 Full Course Notes
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Demography is the study of human populations: study of factors determining size & structure of population, demographers includes population size, density and distribution, age structure, sex ratio, birth, death, immigration, emigration rates. Ways to look at growth: per capita rate = (birth rate + immigration) (mortality rate + emigration)/ population. Population, affluence, and technology affect the environment: the ipat model: i = p x a x t x s. Impact (i) on the environment results from the interaction of the following: population (p) = individuals need space, resources, affluence (a) = greater per capita resource use, technology (t) = intensification, sensitivity (s) = sensitivity to human impacts. Trends: global population is increasing precipitously, per capita ef is increasing slowly, global biocapacity is decreasing, ratio of ef/biocapacity is increasing dramatically, global biocapacity (2005) was 13. 4 billion ha of biologically productive land and water .

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