Cited by 65Climate Change and Environmental ImpactClimate Change Policy and EconomicsClimate Change Communication and Perception

The most important thing about climate change

Open access
Broome, John·2010·Public Policy: Why ethics matters

Abstract

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Integrity signals

Registry

Crossref · 10.22459/pp.10.2010.06

Cites

15 of 15 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

2 of 9 cited sources checked · 1 supported · 1 flagged · accuracy not yet measured

  • Findingreasoning
    § Deaths

    The expected number of deaths from extreme climate change is in the range of tens of millions.

    “Then the expectation of the number of deaths is 9 billion divided by a thousand, which is 9 million.If the probability is as high as one in a hundred, the expectation is 90 million.The expectation is, therefore, in the range of tens of millions of people killed.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: If there is extreme warming, the earth will not be able to sustain anything approaching our present population; population would have to shrink by billions.
  • Findingreasoning
    § Deaths

    Likely climate change will kill tens of millions of people.

    “We must, therefore, expect likely climate change to kill tens of millions of people.”
    • Also stated in: § Deaths · hedged
      “I think we might estimate that half a million people will be killed each year by likely climate change; that would be a conservative figure.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites IPCC 1996

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites IPCC 2007b

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites FAO 2009

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Interpretationreasoning
    § The very most important thing about climate change

    In the case of climate change, resources will need to be transferred from future people to present people to compensate present people for reducing emissions.

    “Therefore, resources will need to be transferred from future people to present people.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Achieving a Pareto superior state will often require resources to be transferred from some people to others.
  • Interpretationreasoning
    § Absences and the intuition of neutrality

    The expected number of absences associated with extinction is vastly greater than the number of deaths expected from likely climate change.

    “Even multiplied by a small chance of one in a hundred or one in a thousand, the expected number of 'absences' -as I shall call them -associated with extinction is vastly greater than the number of deaths to be expected from likely climate change.”
    Quote in the paperSubstantial claim
  • Interpretationreasoning
    § The intuition of neutrality is false

    Whether extinction is good or bad depends on whether future people's well-being will on balance be above or below the neutral level.

    “If their well-being will on balance be above the neutral level, extinction would be a bad thing.If their well-being will on balance be below the neutral level, extinction would be a good thing.”
    Quote in the paperSubstantial claim
    • The authors state this as an assumption: There is a neutral level of lifetime well-being such that if B's extra person lives at that level, neither A nor B is better than the other.
  • Classified as probably not a substantial claim. 9
  • May combine two claims. 9
  • Classified as probably not a substantial claim.

    Premisecitation
    § Expected utility theory and very bad possibilities

    Weitzman does not try to estimate the badness of a catastrophe; he assumes it would obviously be so bad that an estimate would be otiose.

    “Weitzman does not try to estimate the badness of a catastrophe.He seems to assume it would obviously be so bad that an estimate would be otiose.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Weitzman (2009) source

      Section IV, “The Key Role of a VSL-Like Parameter” (page unavailable), gives rough numerical estimates for catastrophic losses and says they can convey crude quantitative implications. Section VIII, “Conclusion” (page unavailable), cautions that estimating the extent of the worst imaginable catastrophe may be accurate only within an order of magnitude. Weitzman treats estimation as highly uncertain, not as unnecessary because the catastrophe is obviously bad. (LLM, conf=0.88)

      Checked by a reasoning model — may be wrong.

      Experimental — accuracy not yet measured
  • Classified as probably not a substantial claim.

    Premisecitation
    § Expected utility theory and very bad possibilities

    Weitzman claims that the most important thing about climate change is the small chance of catastrophe.

    “Weitzman claims that the most important thing about climate change is the small chance of what he calls a 'catastrophe'.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Weitzman (2009) source
  • May combine two claims.

    Findingreasoning
    § The very most important thing about climate change

    The current generation is unwilling to make sacrifices, as shown by the experience in Copenhagen.

    “But to reach C the current generation has to make sacrifices, and the experience in Copenhagen shows it is unwilling to do so.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationreasoning
    § The intuition of neutrality is false

    General hedonism implies that the neutral level of well-being is the level of a life that contains no pleasure and no pain.

    “According to general hedonism, the neutral level of well-being is therefore the level of a life that contains no pleasure and no pain.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning
    § Consequences of catastrophe

    Extreme climate change would cause billions of people to die early.

    “The first of these more approachable sorts of badness is that billions of people would die early.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: If there is extreme warming, the earth will not be able to sustain anything approaching our present population; population would have to shrink by billions.
  • May combine two claims.

    Premisecitation
    § Expected utility theory and very bad possibilities

    The IPCC report suggests as much as a 5 per cent probability of warming greater than about 8°C, and perhaps a 1-2 per cent probability of warming greater than 10°C.

    “studies referred to in the report suggest there is as much as a 5 per cent probability of warming greater than about 8ºC, and perhaps a 1-2 per cent probability of warming greater than 10ºC (IPCC 2007a, section 9.6).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites IPCC 2007a, section 9.6

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationreasoning
    § The very most important thing about climate change

    There is a Pareto superior state that is efficient, with no other state Pareto superior to it.

    “Moreover, there is a Pareto superior state that is efficient, which means no other state is Pareto superior to it.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S2 (checkable). May combine two claims.

    Interpretationnone given
    § Conclusion

    We cannot just assume the small chance of catastrophe is the most important thing about climate change; we must work out how bad the catastrophe would be.

    “We have learnt, first, that we cannot just assume the small chance of catastrophe is the most important thing about climate change.It may or may not be.To know which, we must work out just how bad the catastrophe would be.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationreasoning
    § The very most important thing about climate change

    If we reduce emissions and transfer resources correctly, future generations will end up better off on balance, and present people will be no worse off.

    “We know from the elementary economic theory that, if we do the transfer correctly, future generations will end up better off on balance, and we shall be no worse off.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning
    § Absences and the intuition of neutrality

    Likely climate change will also cause absences, and the expected number may be as great as the expected number associated with extinction.

    “The expected numbers of these absences may well be as great as the expected number associated with extinction.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Premisereasoning
    § The very most important thing about climate change

    Climate change is an externality.

    “Climate change is what economists call an externality.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation
    § The very most important thing about climate change

    The Stern Review compares outcome C with outcome A and finds C much better than A, recommending C.

    “The Stern Review in effect compares C with A by means of a costbenefit analysis, and finds that C is much better than A. It recommends us to choose C.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Stern 2007
  • May combine two claims.

    Interpretationreasoning
    § Ethics and climate change

    Ethics is relevant to public policy on climate change; economists such as Weitzman need ethics because their judgements about how governments ought to behave are ethical.

    “Among the protagonists in the debate about public policy in response to climate change, many think ethics is irrelevant.Most of the protagonists are scientists and economists, and they think they need no contribution from moral philosophy.They are wrong.”
    • Also stated in: § Ethics and climate change · plain
      “Weitzman needs ethics.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning
    § The very most important thing about climate change

    It would be better to reduce emissions and not compensate ourselves than to reduce emissions and compensate ourselves.

    “But it would be even better if we reduced our emissions and did not compensate ourselves for doing so.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing).

    Interpretationreasoning
    § Ethics and climate change

    Weitzman's judgement that the discount rate governments use should be derived from people's preferences about private savings is an ethical judgement.

    “This judgement of Weitzman's is an ethical one, because it is about how governments ought to behave towards future generations.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Weitzman (2007) source
  • May combine two claims.

    Interpretationreasoning
    § The very most important thing about climate change

    Because climate change is an externality, there is a Pareto superior state we could move to, involving emitting less greenhouse gas.

    “Because climate change is an externality, there is a Pareto superior state we could move to.It will involve emitting less greenhouse gas.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: Externalities cause inefficiency.
16 of 16
  • The paper relies on this without support.

    A 10°C warming is likely to melt Antarctica and raise the seas by 70 metres.

    “A 10ºC warming is likely to melt Antarctica, and that will raise the seas by 70 metres.”
  • The authors state this as an assumption.

    There is a neutral level of lifetime well-being such that if B's extra person lives at that level, neither A nor B is better than the other.

    “I assume there is indeed such a level of well-being, and I call it the 'neutral level'.”
  • The authors state this as an assumption.

    The weak version of the intuition of neutrality is false.

    “Still, in this chapter I shall take it for granted that the weak version is also false.”
  • The paper relies on this without support.

    Externalities cause inefficiency.

    “Elementary economics tells us that externalities cause inefficiency.”
  • The paper relies on this without support.

    Achieving a Pareto superior state will often require resources to be transferred from some people to others.

    “The theory of externalities tells us that achieving a Pareto superior state will often require resources to be transferred from some people to others.”
  • The paper relies on this without support.

    If there is extreme warming, the earth will not be able to sustain anything approaching our present population; population would have to shrink by billions.

    “One thing is sure: if there is extreme warming, the earth will not be able to sustain anything approaching our present population.Our population would have to shrink by billions.”
6 of 6

Cites

Flagged first, then by citations

4 of the 19 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. [5]5. IPCC (Intergovernmental Panel on Climate Change). 1996. Climate Change 1995: Volume III: Economic and social dimensions of climate change. Cambridge, UK: Cambridge University Press.
  2. [9]9. Parfit, D. 1984. Reasons and Persons. Oxford: Oxford University Press.

Cited by

Sorted by citations

Authors
Broome, J.
Corresponding author
Broome, John
Venue
Public Policy: Why ethics matters
Publisher
ANU Press
Published
2010-10
OpenAlex
W889953352
Cited by
65
References
19
Citations by year
2026: 1 · 2025: 1 · 2024: 9 · 2023: 6 · 2022: 2 · 2021: 5 · 2020: 16 · 2019: 2 · 2017: 2 · 2016: 3 · 2015: 6 · 2014: 3 · 2013: 3 · 2012: 5
FWCI
8.59
Type
book chapter
Language
en
Open access
Locations
  • ANU Press eBooks (publishedVersion)
  • Oxford University Research Archive (ORA) (University of Oxford) (submittedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Environmental Impact
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Climate Change Policy and Economics
  • Social Sciences › Sociology and Political Science › Climate Change Communication and Perception
Keywords
climate change

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