In a previous blog, I used a lake surrounded by houses to illustrate the Tragedy of the Commons, a situation where the actions of individuals, motivated by their own self-interest, results in the destruction or damage of common assets, much to the detriment of the collective group. The pollutant used in the example was sewage, which is bio-degradable. As long as the emission rate is less than the lake’s ability to absorb or process the pollutant, it does not cause permanent damage to the environment.