Global catastrophic risk
A global catastrophic risk is a hypothetical future event with the potential to seriously damage human well-being on a global scale. Some events could destroy or cripple modern civilization. A severe event, one that could cause human extinction, is known as an existential hazard.Potential global catastrophic risks include but are not limited to hostile artificial intelligence, nanotechnology weapons, climate change, nuclear warfare, and pandemics.Researchers experience difficulty in studying human extinction directly, since humanity has never been destroyed before. While this does not mean that it will not be in the future, it does make modelling existential risks difficult, due in part to survivorship bias.