Defence in Depth Against Human Extinction: Prevention, Response, Resilience, and Why They All Matter.

Area of Science:

• Existential Risk Studies
• Catastrophe Theory
• Global Security

Background:

• Humanity faces various extinction risks that can be categorized by their impact.
• Existing defense layers aim to prevent, mitigate, and build resilience against catastrophic events.

Purpose of the Study:

• To classify extinction risks based on their damage initiation, global scale, and universal reach.
• To identify the most significant extinction probabilities arising from weaknesses in defense layers.
• To propose strategies for strengthening these defense layers and addressing underlying risk factors.

Main Methods:

• Classification of extinction risks into three phases: damage initiation, global scaling, and universal reach.
• Analysis of the effectiveness of three defense layers: prevention, response, and resilience.
• Identification of risk factors that can undermine defense mechanisms.

Main Results:

• The highest extinction probability occurs when all three defense layers are weak.
• Investing in strengthening all defense layers is generally the most effective strategy.
• Underlying risk factors can weaken defenses without directly posing an extinction threat.

Conclusions:

• A multi-layered defense approach is essential for mitigating existential risks.
• Tailored strategies are needed to bolster prevention, response, and resilience.
• Addressing underlying structural conditions is critical for long-term survival.