In Hardin’s analogy, large entities such as nations or the biosphere are likened to a boat, while smaller entities – for example, migrating individuals or groups – are likened to swimmers trying to board the already cramped vessel and exploit whatever resources are on board. In the imagined scenario, it is believed that the boat is near carrying capacity, but exactly how near is not known with certainty given the many future possibilities. A central question focuses on at what point, if any, the risk of sinking the entire boat outweighs the good provided for each additional rescued swimmer.

The metaphor of the lifeboat has structured thought about conservation, economics, ethics, and any number of other disciplinary areas for decades. The question I would like to pose is the following: Is the lifeboat scenario still (or was it ever) an apt metaphor for structuring thought about ethical conservation of resources, or have we reached a stage where the boat should be scuttled in favor of either a new metaphor or more literal language? Please feel free to post any thoughts you may have on this issue.