Tragedy of the commons, is the depletion of a shared resource by individuals, acting independently and rationally according to each one's self-interest, despite their understanding that depleting the common resource is contrary to the group's long-term best interests.
Tragedy of the commons is the tragedy of modern China.
There are multiple examples.
Commons resources are air, temperature, rain, public space...
Let's take the example of cars.
All Chinese people or almost all Chinese people want to buy a car.
Consequences are disastrous for common resources. Cars park everywhere and even on the sidewalk. With toxic gazes and car air conditionning units, Chinese cities air is over polluted and temperature unbearable. Abusive uses of horn generates a constant vacarm.
Let's take another example: air conditioning.
A few years ago few Chinese people had air conditioning units.
Older housings are very well built. They enable a good ventilation while opening windows! Furthermore, material used, woods, bricks isolate well of heat and cold!
Inhabitants only had a fan fixed on the ceiling.
New constructions are often not well conceived. It is impossible to live without air conditioning. Isolation is inexistant. It is also difficult to aerate well.
Nowadays, everyone installs his air conditioning unit at home.
Thus in the evening and week-ends, temperature rises 5 degrees higher at least!
Impossible to keep windows open, you are forced to use and air conditioning as well!