Living Within Limits

Hardin, an ecologist best known for the 1968 essay on the tragedy of the commons, argues that human population and consumption face physical limits, that economic reasoning systematically ignores them, and that the failure to address this produces the outcomes he describes.

His analytical core is carrying capacity, meaning the population an environment can sustain indefinitely, and his argument that exceeding it degrades the environment's capacity permanently rather than producing a temporary shortfall. He is hostile to what he calls the perpetual growth assumption embedded in economics, and argues that exponential growth in a finite system has only one outcome regardless of the rate.

His treatment of the commons is developed further here than in the original essay. He argues that a resource open to all will be degraded because each user captures the full benefit of additional use while bearing only a share of the cost, and that the solutions available are either private ownership or what he calls mutual coercion mutually agreed upon.

The book's most controversial material concerns population and immigration. Hardin argues against food aid on the grounds that it raises population beyond carrying capacity, and against immigration on similar grounds, and his lifeboat ethics essay makes the argument explicitly. These positions have been condemned widely, and Hardin's association with anti-immigration and eugenic organisations is documented. Elinor Ostrom's work showed that communities regularly manage common resources successfully through local institutions, which directly contradicts Hardin's claim that only privatisation or coercion is available. Readers should engage with the carrying capacity argument and should be aware of what the author attached to it.