A Global Catastrophic Risks(GCR) is a hypothetical future event that could damage human well-being on a global scale, even endangering or destroying modern civilization. An event that could cause human extinction or permanently and drastically curtail humanity's potential is known as an existential risk.

GCRs could be the result of Natural as well as Anthropogenic causes. They  are both capable of causing  the Twin Risks to life on Earth (especially to Humanity )

• Societal Collapse (Irreversible)

• Mass Extinction

Thus, the GCD framework has limited the definition of Global Crisis (GC) to only certain category of Global Catastrophic Risks (GCRs) resulting from anthropogenic causes leading to Collapse & Mass Extinction. 

GC is primarily concerned with Anthropogenic GCRs, namely:

• Overshoot : Sink (Pollution) & Source (Scarcity) related Risks 

• Complexity : High Complexity & Low Resilient Critical Infrastructures Risks 

• Tech-Risks : Dual-Use run-away technologies risk multipliers