This article gives a wonderful overview of tipping point theory, where a large system can be brought into a different state by a small perturbation.
Searching online I have found mostly articles on theoreticly based studies on tipping point theory and some speculating on the consequences that may occur due to global warming.
I am wondering if these tipping point theories are still all theoretical or are there any historical examples that provide as a base for these anticipated changes? For example, area the transitions between Eras and Periods also caused by tipping points or are they more gradual changes of the system because they occur on a very large timescale?