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Evidence library  |  Lincoln-Douglas  |  September/October 2026

Resolved: Outer space colonization is a moral imperative.

Twenty-two sources across philosophy, space policy, law, and science. The affirmative core is existential-risk reduction and the duty to future people; the negative core is present obligations, the non-identity problem, feasibility, and the geopolitical and colonial critique.

22 sources  |  Verified  |  Block file  |  Topic archive

22 sources

Affirmative: existential risk and future generations

Existential risk reduction should be a global priority

Bostrom, N. (2013). Existential Risk Prevention as Global Priority. Global Policy, 4(1), 15-31. DOI

Argues that the expected value of humanity's future is so large that small reductions in extinction probability outweigh almost any other project. The foundational source for the affirmative criterion.

affSupports: FrameworkCut this card

Future generations have moral standing

Ord, T. (2020). The Precipice: Existential Risk and the Future of Humanity. Hachette. theprecipice.com

Surveys natural and anthropogenic existential risks and argues that safeguarding humanity's long-term potential is a defining moral task of this century.

affSupports: FrameworkCut this card

Space settlement is an efficient existential-risk hedge that societies undervalue

Gottlieb, J. (2019). Discounting, Buck-Passing, and Existential Risk Mitigation: The Case of Space Colonization. Technology in Society (author manuscript). Author PDF

Argues that self-sufficient space settlement is a plausible means of reducing existential risk, and that because risk reduction is an intergenerational public good, societies systematically undervalue it, which is a reason to treat it as a duty rather than a preference.

affSupports: Contention 1Cut this card

Answers the conservation objection to colonizing Mars

Gottlieb, J. (2019). Space Colonization and Existential Risk. Journal of the American Philosophical Association, 5(3). Cambridge Core

Responds to Stoner's argument that we ought not colonize Mars, holding that existential-risk considerations can outweigh the principle of scientific conservation. Use to pre-empt the negative's scientific-preservation argument.

affSupports: Contention 1Cut this card

There is a moral obligation to support space colonization

Schwartz, J. S. J. (2011). Our Moral Obligation to Support Space Colonization. Environmental Ethics, 33(1), 67-88. PhilPapers search

An early, direct philosophical defense of the claim that supporting colonization is obligatory, grounded in obligations to future people. The negative will note that Schwartz later urged caution (see the 2019 article below), which is itself useful in cross-examination.

affSupports: Contention 1Cut this card

Planetary-scale natural hazards are real and recurring

National Academies of Sciences, Engineering, and Medicine (2023). Origins, Worlds, and Life: A Decadal Strategy for Planetary Science and Astrobiology 2023-2032. National Academies Press

The decadal survey documents the scientific consensus on impact hazards and planetary defense priorities; the affirmative uses it for the natural-risk half of the single-point-of-failure argument.

affSupports: Contention 1Cut this card

Settlement capability is being built now, so the imperative binds now

NASA (2022). Moon to Mars Objectives. nasa.gov

Sets out staged objectives for sustained lunar presence and crewed Mars missions, including habitation, life support, and resource utilization. Use to show the decision is present, not hypothetical.

affSupports: Contention 2Cut this card

The Artemis Accords are the governing framework for a growing coalition

NASA. The Artemis Accords. nasa.gov

NASA's page on the Accords, the principles for civil exploration signed by a large and growing group of nations. The affirmative uses it to argue that colonization can proceed under agreed norms; the negative uses the parallel China-Russia bloc to argue the opposite.

affSupports: Contention 2Cut this card

Space exploration as a source of cooperation and shared humanity

Walkowicz, L., discussed in The Ethics of Escape: Should Humanists Support Space Colonization? TheHumanist.com, June 2, 2025. TheHumanist.com

Summarizes the argument that exploration beyond Earth can catalyze cross-cultural cooperation and extend humanity's resilience beyond one vulnerable planet, with the pandemic and climate crises as the motivating context.

affSupports: Contention 2Cut this card

Negative: present obligations, non-identity, and feasibility

Obligations to merely possible future people are weaker

Parfit, D. (1984). Reasons and Persons. Oxford University Press, Part Four. Stanford Encyclopedia entry

The non-identity problem: choices that determine which future people exist cannot straightforwardly wrong those people. Grounds the negative framework that determinate obligations to the living come first.

negSupports: FrameworkCut this card

Humans should not colonize Mars

Stoner, I. (2017). Humans Should Not Colonize Mars. Journal of the American Philosophical Association, 3(3), 334-353. Cambridge Core

Argues that colonizing Mars would violate a pro tanto obligation of scientific conservation, and that no countervailing consideration overrides it. The primary published case against the resolution's core example.

negSupports: Contention 1Cut this card

Space settlement: what's the rush?

Schwartz, J. S. J. (2019). Space Settlement: What's the Rush? Futures, 110, 56-59. DOI

Argues for the primacy of scientific interests over settlement and questions the urgency claims behind colonization advocacy. Useful because the author earlier defended the obligation, which undercuts the affirmative's use of him.

negSupports: Contention 1Cut this card

Early-phase colonization does little for existential risk; Earth investment helps more people sooner

Viterbi Conversations in Ethics (USC), Volume 7, Issue 3 (2025). Space Colonization and Why Humanity Is Better Off Not Pursuing It. USC Viterbi

A utilitarian essay arguing that early colonization does little to mitigate existential risk while diverting resources that would improve more lives on Earth in the same period. Student journal; use for the argument shape, then cut stronger evidence for the numbers.

negSupports: Contention 1Cut this card

Settlements without a breathable atmosphere face foundational failure risks

Gottlieb, J. (2019). Space Colonization and Existential Risk (manuscript), section on success factors. PhilArchive PDF

Notes that any settlement without an indigenous breathable atmosphere depends on technology liable to malfunction, and that colonist well-being includes personal liberties, both of which are conditions of success the affirmative must address. Cut from the manuscript version.

negSupports: Contention 1Cut this card

Reproduction in a long-term Mars base raises biological and social problems

Szocik, K., et al. (2018). Biological and social challenges of human reproduction in a long-term Mars base. Futures, 100, 56-62. Futures (ScienceDirect)

Reviews the medical and social obstacles to a self-sustaining population off Earth. Use for feasibility and for the welfare of the people a colony would create.

negSupports: Contention 1Cut this card

Space expansion increases catastrophic risk

Deudney, D. (2020). Dark Skies: Space Expansionism, Planetary Geopolitics, and the Ends of Humanity. Oxford University Press. Oxford University Press

The most complete critique: expansion produces militarization, planetary-scale weapons, and political fragmentation that raise rather than lower catastrophic risk. The negative's turn on the affirmative criterion.

negSupports: Contention 2Cut this card

Existential-risk framing requires global coordination and caution, not a race

Duke Law and Technology Review. Space and Existential Risk: The Need for Global Coordination and Caution. Duke Law PDF

A law review article arguing that the success of settlement depends on unresolved social, legal, and political questions and that uncoordinated expansion raises risk. Use for the negative's coordination-first alternative.

negSupports: Contention 2Cut this card

International law forbids national appropriation

United Nations (1967). Outer Space Treaty, Article II. UNOOSA

Outer space, including the Moon and other celestial bodies, is not subject to national appropriation. The negative uses it to argue that the colonization model conflicts with the existing legal order.

negSupports: Contention 2Cut this card

Why the Outer Space Treaty is in tension with colonizing Mars

Harvard International Law Journal (April 2025). Tomorrow for which we are not prepared: Why is the Outer Space Treaty opposed to the idea of colonizing Mars? Harvard ILJ

Explains the legal hurdles that settlement plans, including private ones, face under the treaty regime, alongside the technological and ethical hurdles.

negSupports: Contention 2Cut this card

Frontier property claims import terrestrial failures

Milligan, T. (2015). Nobody Owns the Moon: The Ethics of Space Exploitation. McFarland. McFarland

Examines property and resource claims beyond Earth and argues that the exploitation model repeats the politics of terrestrial frontiers.

negSupports: Contention 2Cut this card

Two rival coalitions are racing for the same lunar sites

Debate Arguments (Substack), June 24, 2026. Resolved: Outer Space Colonization Is a Moral Imperative (S/O LD). Substack

A topic analysis noting the split between the Artemis Accords coalition and the China-Russia lunar research station bloc, both targeting the water-ice-rich lunar south pole, and the equity critique from nations without launch capability. Secondary source; follow its citations to primary ones.

negSupports: Contention 2Cut this card

The ethical risks of colonization, surveyed

Sus, V. (2026). The Ethics of Space Colonization: Risks and Perspectives. TheCollector, June 15, 2026. TheCollector

A survey of utilitarian, deontological, and existential objections and defenses. Use for the map of arguments and for cross-examination questions; cite primary sources in the round.

negSupports: OverviewCut this card

Block file

The arguments each side will hear, with numbered responses. Read the responses aloud with the timer; each set should take forty-five to seventy-five seconds.

Answering the negative

•Present obligations to the living come first3 responses
  1. Existential-risk reduction is an obligation to the living: they are alive when the risk materializes and their children are the first generation lost.
  2. Irreversibility: present harms the negative names are recoverable; extinction is not, so a smaller probability of an irreversible harm outweighs.
  3. The two duties do not trade off at scale: space budgets are a small fraction of public spending and do not fund the present obligations the negative lists.
•Non-identity: future people cannot be wronged3 responses
  1. The affirmative does not need to wrong a particular future person; it needs a reason to preserve the possibility of future people at all, which non-identity does not touch.
  2. Parfit himself treats extinction as among the worst outcomes; read the same source.
  3. Even on the negative view, present people have interests in their descendants' existence.
•Colonization repeats colonialism3 responses
  1. No inhabitants, no dispossession: the analogy needs a wronged party.
  2. The affirmative defends colonization done under the Outer Space Treaty and the Artemis principles, not a private land grab; the resolution asks whether the project is imperative, not whether every version is just.
  3. Turn: refusing to build shared governance for settlement is what leaves the field to the least accountable actors.
•Deudney: expansion increases catastrophic risk3 responses
  1. Deudney's risks (militarization, weaponized asteroids) come from space capability, which exists whether or not humans settle; the resolution concerns settlement, not capability.
  2. Coordination is the answer to those risks, and coordination is easier when settlement is a shared public project than when it is a race.
  3. Weigh: speculative political risks against the documented natural risks a second location hedges.
•Feasibility: no colony can be self-sustaining3 responses
  1. An imperative can be hard; difficulty is a reason to start, not to refrain.
  2. Life-support, resource-use, and habitation milestones are on NASA's published objectives and are advancing.
  3. The negative's feasibility evidence describes early settlements; the affirmative defends a multigenerational project.
•Scientific conservation: settling Mars destroys evidence of life3 responses
  1. Gottlieb's response: existential-risk considerations can override the conservation principle.
  2. Conservation and settlement are compatible with protected zones, as on Earth.
  3. The resolution is about outer space, not Mars alone; the negative's example does not cover the Moon or orbital habitats.

Answering the affirmative

•Existential risk outweighs everything3 responses
  1. Action-guidance: if any nonzero risk reduction always wins, the framework cannot guide choices; ask in cross-examination what could ever outweigh it.
  2. Probability discounting: the affirmative's impact is enormous but remote; justice attends to certain present wrongs.
  3. Turn: Deudney shows expansion raises catastrophic risk, so the affirmative's own criterion cuts against colonization as practiced.
•A second location hedges natural catastrophe3 responses
  1. The hedge is centuries away; the risks the affirmative names are addressed sooner and more cheaply on Earth (planetary defense, pandemic preparedness).
  2. A settlement dependent on Earth for supplies does not survive Earth's catastrophe.
  3. Szocik: reproduction and social viability off Earth are unsolved, so the hedge is not a hedge.
•The imperative binds now because capability is being built3 responses
  1. Building capability is not colonizing; the negative can support exploration and science while denying an imperative to settle.
  2. Schwartz (2019): the rush is unjustified; science should lead.
  3. Present decisions are being made by rival coalitions racing for the same lunar sites, which is the negative's conflict impact.
•Future people count equally3 responses
  1. Grant it and still win: obligations to future people are best met by preserving Earth's habitability, which the affirmative's spending competes with.
  2. Non-identity: the affirmative cannot identify who is wronged by staying home.
  3. Equal counting produces the repugnant conclusion the affirmative has not defended.

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