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This data visualization explores the correlation between world population, irrigated farmland area, and fertilizer applied. The graph showcases the relative rates of change over time and highlights the stages of population growth. It also examines the population density of Nigeria as a case study.
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World Population vs. Irrigated Farmland Area vs. Amount Fertilizer Applied Note the appropriate axes for the different lines. Line’s slope=rate, i.e., something per unit time. Relative Rates: What do they tell us? hc = hectare, 1 hc ~ 2.5 acres CVS4, Fig. 1.1
World Population Growth through History Linear vs. Exponential Growth Rates Both the x-axis & y-axis are linear Black Death 1348 CVS4, Fig. 1.2
Stages: Over Time x- and y-axes both have linear scales
Population Density of Nigeria, in # people/km2 From: http://en.wikipedia.org/wiki/File:Bev%C3%B6lkerungsdichte_Nigerischer_Bundesstaaten_english.PNG
Reserves Constantly changing amount (in practice) Resources (in principle) Fixed amount From Keller, 2011