Population, Carrying Capacity, and Environmental Impact

Current global population is over $8$ billion, last estimated at approximately $8.2$ billion.
Significant increase in the last century: individuals born in 1995 or earlier now share the planet with $33\%$ more people.
Those born before the 1970s have witnessed the global population double.

Proposed by Thomas Malthus in "An Essay on the Principle of Population" ( $1798$ ), articulating concerns that food production would not keep pace with population growth.
Malthus argued that human population growth is exponential (geometrically, e.g., $1, 2, 4, 8, …$ ), while food production is linear (arithmetically, e.g., $1, 2, 3, 4, …$ ).
He predicted a point of intersection (a "Malthusian catastrophe") where population would inevitably outstrip the food supply, leading to a population crash, mass starvation, disease, and conflict as natural checks.
Critique: Malthus's predictions did not fully materialize over the past $200$ years, primarily due to:
- Technological Advancements: Innovations such as the Green Revolution, synthetic fertilizers, improved irrigation techniques, and genetically modified crops significantly boosted agricultural output.
- Demographic Transition: Many developed countries experienced a decline in birth rates, slowing population growth.
- Resourcefulness: Human ingenuity in discovering new resources and enhancing efficiency in resource utilization.