Why global catastrophes probably won't kill us all | Luisa Rodriguez (2021)

Core Thesis: Civilization's Resilience After Catastrophe

• Luisa Rodriguez's research challenges the narrative that a catastrophic event killing 50%–99.99% of the population would lead to permanent civilizational collapse or extinction.
• The primary conclusion is that while such events would cause immense suffering, the probability of "direct extinction" (immediate total annihilation of survivors) or "indirect extinction" (stagnation until a secondary natural disaster wipes out humanity) is low.
• Two distinct extinction pathways are analyzed:
  • Direct extinction: A chain of failures (e.g., starvation, conflict, loss of knowledge) killing all survivors within decades.
  • Indirect extinction: A prolonged stagnation period where civilization fails to recover pre-industrial levels for centuries, allowing a random natural disaster (e.g., super-volcano, asteroid) to occur.
• The research finds that historical analogues and resource constraints do not support the "mad max" or permanent dark age scenarios often imagined in fiction.

Key Variables in Recovery Scenarios

• Non-uniform impact: Catastrophes rarely kill everyone uniformly; geographic pockets (e.g., New Zealand, Southern Hemisphere) often remain largely unaffected by climate shifts or radiation, providing survival bases.
• The "Grace Period": Survivors initially benefit from massive pre-existing stockpiles of food, medicine, and fuel, which can sustain populations for years if rationed, provided infrastructure remains intact.
• Population density interactions:
  • High population loss reduces per-capita resource availability but increases the time resources last due to lower consumption.
  • Low population loss risks rapid resource depletion but preserves more critical skills and knowledge.
• Infrastructure survival:
  • Water: Gravity-fed water systems often remain functional longer than electric pumps; plastic bottles can be used for solar water disinfection.
  • Transport: Internal combustion engines can run on fuel lasting 5–10 years; cars can be maintained indefinitely by scavenging parts, as seen in post-Cold War Cuba.
  • Energy: Solar panels degrade slowly (1% efficiency loss/year) and can be repurposed; small-scale hydro or coal generation is feasible without complex grids.
• Knowledge preservation:
  • Physical artifacts (machinery, tools) often remain recognizable for decades to centuries, accelerating re-invention.
  • Libraries in dry climates (e.g., Egypt) or underground vaults can preserve written knowledge for millennia, though humidity in tropical zones degrades paper quickly.
  • Knowledge loss is concentrated in highly specialized fields (e.g., advanced telecom), but general practical skills (medicine, agriculture) are robustly distributed across the population.

Specific Disaster Scenarios Analyzed

• Pandemic (50–99% mortality with intact infrastructure):
  • High population loss leaves vast resources (food, housing) available.
  • Recovery is likely rapid as survivors congregate in existing cities and former infrastructure (hospitals, grain silos) serves as "attractors" for population consolidation.
• Nuclear War (90–99.99% mortality):
  • Nuclear Winter: Modeled as a temporary climate effect (5–10 years) affecting the Northern Hemisphere more severely than the Southern Hemisphere; does not freeze the entire planet permanently.
  • Radiation: Highly localized to detonation sites; levels drop rapidly (Chernobyl exclusion zones are currently walkable in parts), leaving large habitable zones.
  • Recovery: Historical precedents (Hiroshima, Nagasaki, post-WWII Germany/Japan) show infrastructure and economies can rebound within decades despite massive physical destruction.
• Combined Catastrophe (Nuclear war + long-term climate change):
  • A "worst-case" scenario where nuclear winter is compounded by millennia of climate shifts, potentially rendering agriculture impossible in key regions.
  • Even here, coastal and island regions (e.g., New Zealand, parts of Chile) may retain habitable conditions suitable for fishing and limited agriculture.

Mechanisms Countering "Collapse" Narratives

• Cooperation over conflict:
  • Historical data (post-disaster studies of hurricanes, pandemics, and war) shows that looting and widespread violence are rare; cooperation is a dominant survival strategy.
  • Individual violence is unsustainable in resource-rich environments; groups that cooperate to farm and rebuild outcompete violent groups that deplete resources.
  • Conflict is more likely only in scenarios where all productive opportunities are eliminated (e.g., total resource scarcity with no agriculture), which is statistically improbable given Earth's carrying capacity.
• Historical precedents for rapid recovery:
  • Black Death: Killed 50% of Europe's population but led to higher wages for survivors and eventually spurred the Industrial Revolution.
  • Roman Empire: While a complex system collapsed, regional societies continued to thrive, and the knowledge base persisted.
  • Cuba's "Special Period": Lost access to Soviet fuel and fertilizers; successfully transitioned to oxen-plowed agriculture and maintained food production without mass starvation.
  • POW Camps in WWII: Survivors built functional radios from scavenged materials (pencil graphite, gum wrappers), demonstrating high adaptability.
• Resource availability:
  • Fossil Fuels: Surface coal deposits are abundant enough to restart industrialization; coal-to-oil conversion is feasible.
  • Phosphorus/Nitrogen: Existing environmental reservoirs are sufficient for subsistence agriculture; industrial fertilizers are a luxury, not a survival requirement.
  • Materials: Steel, glass, and concrete last for centuries; recycling and remelting are feasible with rudimentary technology (e.g., clay kilns).

Risks of Stagnation and "Boom-Bust" Cycles

• Technological Stagnation:
  • The "Great Stagnation" hypothesis suggests increasing difficulty in finding low-hanging fruit for innovation, potentially slowing recovery.
  • However, cultural pressure to modernize (e.g., Japan's Meiji Restoration) suggests that even stagnant societies can rapidly adopt technologies when threatened.
  • It is unlikely that all survivor groups would simultaneously coordinate to ban technological progress (the "Butlerian Jihad" scenario).
• Climate Change "Boom-Bust" Scenarios:
  • Rise and Fall: Low productivity growth combined with continued fossil fuel use leads to extreme warming (e.g., 17°C) before mitigation is possible, confining humanity to polar regions.
  • Double Catastrophe: A great power war (e.g., US-China) diverts resources to military spending while ignoring climate mitigation, culminating in a conflict that destroys infrastructure while leaving a hot, uninhabitable planet.
  • Rodriguez notes these scenarios are plausible but require a conjunction of multiple low-probability events (e.g., sustained low growth + failed geoengineering + intense war).

Implications for Long-Termism and Cause Prioritization

• Shift in Cause Prioritization:
  • The research suggests that catastrophes causing collapse without extinction (e.g., pandemics, nuclear war) may warrant less priority than existential risks that guarantee permanent extinction (e.g., AI misalignment, value drift).
  • However, preventing the immediate death of billions remains morally paramount for reasons independent of long-term future potential.
• Mitigation Strategies (Low-Hanging Fruit):
  • Distributed Knowledge Vaults: Storing heirloom seeds, technical manuals (e.g., Lewis Dartnell's The Knowledge), and blueprints in diverse global locations (e.g., Antarctica, deep underground vaults).
  • Infrastructure Resilience: Designing power grids and transport systems to be less interdependent and resistant to cascading failures (e.g., EMPs, solar storms).
  • Food Security: Rebuilding national and global grain reserves to extend the "grace period."
  • Demographic Diversity: Ensuring critical survivor populations include sufficient genetic diversity and gender balance (e.g., increasing women's presence on nuclear submarines).

Personal Narrative: Reconnecting with Biological Father

• Background: Luisa's biological father, Joaquín, fled El Salvador in the late 20th century to escape political persecution after writing and singing protest music. He met Luisa's mother in the US but separated due to parenting style differences.
• The Reconnection:
  • Motivated by curiosity and a desire to understand her genetic heritage, Luisa traveled to Guatemala (2014) and eventually El Salvador.
  • She located her grandmother using visual landmarks (a turquoise door, a lake) and met her, leading to the discovery of her father's location.
  • The reunion with her father was initially awkward but evolved into a relationship based on shared altruistic values and curiosity.
• Current Status: Her father moved to California after facing gang threats in El Salvador; they have reconnected periodically, with Luisa feeling a strong bond, particularly with a sister she also located.
• Career Reflection: Luisa notes that while she is deeply committed to long-termism, her personal desire for a fulfilling career outside of altruism would be psychotherapy, driven by an interest in human psychology and the satisfaction of helping individuals reframe negative thought patterns.

Forward-Looking Statements and Uncertainties

• Unknown Unknowns: The primary uncertainty lies in "unknown unknowns"—scenarios where catastrophic effects are permanent (e.g., multi-thousand-year climate shifts) or where critical knowledge is lost due to low population density.
• Population Recovery Rates: Even in worst-case scenarios (99.99% mortality), exponential growth suggests population could return to current levels within 1,200–7,000 years depending on the growth rate (agricultural vs. hunter-gatherer).
• Innovation Resilience: The research posits that the "degradation of technology" is less about the inability to replicate tools and more about the lack of cultural motivation or coordinated effort to do so, which is unlikely to persist globally for millennia.
• Geoengineering: A potential countermeasure to severe climate warming is geoengineering, which may become a "lesser evil" solution if temperatures rise to 17°C, potentially preventing total extinction.