The world population in 2000 was estimated to be 6.09 billion with a growth rate of 1.4 %/yr.Using an exponential growth model, what would the expected population be in 2050?Alternatively, if a "logistic" growth model were used with a "carrying capacity" of 16 billion, what would the expected population be?[Note: the current (2010) population is 7 billion.]

Exponential growth:P=P₀ e^{r t}

Logistic growth:P=P₀ / [P₀/P_CC + (1 - P₀/P_CC)e^{r t}]