First posited in 1968 by American ecologist Garret Hardin, the Tragedy of the Commons describes a situation where shared environmental resources are overused and exploited, and eventually depleted, posing risks to everyone involved.
The tragedy of the commons is an economic problem in which every individual has an incentive to consume a resource at the expense of every other individual with no way to exclude anyone from consuming. It results in overconsumption, under investment, and ultimately depletion of the resource.