Megafires in Australia: a climate tipping point, live
The expression ‘tipping point’ refers to the point when a system passes from one system of equilibrium to another, the point where it is no longer possible to prevent accumulated quantitative changes from causing a qualitative change. It is used in many different fields, from population studies to climate change, as well as social sciences.
The spectre of a ‘hothouse planet’
The evolution of the Greenland ice cap provides an important example of a tipping point in the climate field. We know that the disappearance of the entire island’s ice cap will raise ocean levels by approximately seven meters. Specialists have observed that the melt has speeded up to a disturbing extent [1], but the ice cap does not seem to have entered an irreversible break-up process yet. According to IPCC, its tipping point would be located between 1.5°C and 2°C heating. At current emissions rates, we would enter the danger zone towards 2040…