Human activity is the main cause of current global warming.

1. Pass Title matches the evidence

   Title 'Human activity is the main cause of current global warming' matches finding True and the evidence items on warming fingerprints, greenhouse-gas measurements and attribution assessments.

2. Pass No obvious contradictions

   Finding True, answer and conclusion agree; no sections state incompatible facts or numbers.

3. Pass Plausible justification

   Conclusion gives a clear reason (measured greenhouse gases, fingerprint pattern, natural drivers not explaining the trend) that follows from the listed evidence.

4. Pass Sources are relevant

   IPCC AR6, NASA, NOAA GML and National Academies are on topic for attribution of warming and greenhouse-gas measurement.

5. Pass Common questions answered

   Two objections (pre-industrial climate change; model imperfection) each receive a response that addresses the question.

Coverage: Read the full article payload; sources judged by name/title/description/role only, per First Look's rules; no source snapshots read.

1. Concern (minor) Claims are supported and labeled

   Cite sources for O2 decline (e1), nighttime warming (e2), and the 'energy-budget calculations' in the summary, or remove them; cited sources don't cover them.

   Central claims are well supported (IPCC SPM A.1, A.1.2, A.1.3; NASA; NOAA). However several peripheral specifics are not supported by any cited source: e1 'declining atmospheric oxygen are consistent with large-scale combustion of fossil fuels' - neither the NOAA CO2 trends page nor NASA mentions oxygen; e1 cites NOAA for 'methane, and other greenhouse gases' but the cited NOAA page covers CO2 only; e2 'Observed ocean warming, nighttime temperatures... align with modelled greenhouse influence' - NASA's page covers the stratosphere/surface contrast only, and the IPCC SYR SPM does not discuss nighttime temperatures; the summary lists 'energy-budget calculations' as a line of evidence but no evidence item presents or cites it. These are true to my knowledge, so a reader's belief would not change, but they are uncited. Confidence: High.

   About evidence:greenhouse-measurements, evidence:warming-fingerprints, source:noaa-carbon-dioxide, conclusion The finding

2. Pass Central claims are accurate

   Main claim: human greenhouse-gas emissions are the main cause of current warming (finding True, High confidence). Ratings: (1) Claim/finding/answer/conclusion 'dominant cause' - True: IPCC SYR SPM A.1 'Human activities, principally through emissions of greenhouse gases, have unequivocally caused global warming'; A.1.2 best-estimate human-caused warming 1.07°C vs observed 1.09°C (A.1.1). (2) e1 sustained GHG rise and isotope fingerprint - True: NOAA Mauna Loa record since 1958 (426.07 ppm Sept 2026); NASA 'raised atmospheric carbon dioxide levels by nearly 50% since 1750... distinctive isotopic fingerprint'; IPCC A.1.3 GHG increases 'unequivocally caused by GHG emissions from human activities'. The 'declining atmospheric oxygen' sub-claim is not in any cited source (Unverifiable from sources; consistent with well-known O2 records). (3) e2 surface warming with upper-atmosphere cooling - True: NASA 'observed a cooling in the upper atmosphere and a warming at the surface and lower parts'. 'Nighttime temperatures' sub-claim not in cited sources (Unverifiable). (4) e3 natural drivers cannot explain trend - True: IPCC A.1.2 natural drivers -0.1 to +0.1°C, internal variability -0.2 to +0.2°C; NASA solar irradiance 'no net increase since 1880'. (5) e4 assessments converge - Mostly True: IPCC language confirmed; the Royal Society/NAS landing page lists 'How do scientists know that recent climate change is largely caused by human activities?' but the report text was not readable. No central claim is Mixed or worse. Confidence: High.

3. Pass Sourcing is strong and transparent

   Central attribution rests on IPCC AR6 SYR SPM (authoritative primary assessment) plus NOAA's primary Mauna Loa measurement record and NASA's institutional explainer, which itself cites IPCC WG1 and Friedlingstein et al. 2022. The Royal Society/NAS 'Climate Change: Evidence and Causes' is a high-quality joint academy synthesis, though the cited URL is a landing page (live 403; Wayback capture read) and the substantive PDF is only linked from it; its page states it 'builds upon... the newest climate change assessment from the United Nations’ Intergovernmental Panel on Climate Change'. No partisan, anonymous, or circular sourcing; source-to-claim mapping is given per evidence item. The uncited specifics are reported under claims-supported. Confidence: High.

4. Pass Context is complete

   The context notes 'Climate has always changed through natural processes' and that natural factors 'do not explain the magnitude and pattern'; e3 notes short-interval variability. The article does not quantify the attribution (IPCC A.1.2: human-caused 0.8-1.3°C, best estimate 1.07°C, with aerosols offsetting 0.0-0.8°C), and does not mention aerosol cooling, but adding these would strengthen rather than change the reader's impression. No contrary evidence of consequence is omitted. Confidence: High.

5. Pass Framing is fair and neutral

   The claim is stated as it circulates ('Human greenhouse-gas emissions are the main cause of the current global warming trend'). Objections are acknowledged respectfully ('That is correct, but it does not identify the cause of today’s change'; 'Models have uncertainty, especially at regional scales'). No loaded language or selective emphasis that shifts the impression. Confidence: High.

6. Pass Uncertainty is stated

   High confidence is consistent with IPCC's 'unequivocally caused' language and quantified ranges. Limitations are stated per item (no single fingerprint is unique; short intervals vary; assessments synthesize rather than experiment), and the model objection acknowledges regional uncertainty. Evidence on the central question is not materially in conflict, so no weighing is missing. Confidence: High.

Coverage: Read all four cited sources via get_source_snapshot: IPCC AR6 SYR SPM (live, full text, 126k chars, searched for Section A.1 attribution statements); NASA 'The Causes of Climate Change' (live, full); NOAA GML CO2 trends (live, full); Royal Society/NAS 'Climate Change: Evidence and Causes' (Wayback capture of 2023-09-21; live URL returned 403). The Royal Society capture is only the project landing page; the downloadable PDF report with the substantive content was not available to read, so claims attributed to it were checked only against its question list and project description and against IPCC AR6. The resource link (NOAA dataset) is the same URL as source noaa-carbon-dioxide. No live web search.

1. Concern (minor) Confidence matches the evidence

   Drop 'energy-budget calculations' from the summary or add an evidence item presenting them; no evidence item covers that line.

   High confidence is justified by multiple methods (direct monitoring, fingerprinting, forcing comparison) and I would give High too. However, the summary claims the finding rests on 'energy-budget calculations' alongside the other lines; no evidence item presents energy-budget evidence, so the summary lists more support than the article shows. A reader's belief would not materially change. The conclusion also never quantifies 'main' (how much of the warming is attributed), but e3 as stated carries that inference adequately. Confidence: High.

   About conclusion The finding

2. Concern (minor) Strongest objections answered

   Add objections on CO2 'saturation' and on temperature-record reliability (urban heat, adjustments), answered with evidence.

   Objections addressed: 'The climate changed before humans burned fossil fuels' and 'Climate models are imperfect', both answered with reasoning. The strongest alternative explanation, the Sun, is handled substantively in e2/e3 (stratospheric cooling, natural forcing comparison), and internal cycles are mentioned in e3. The article does not address whether added CO2 still matters given claims that its absorption is 'saturated', nor whether the surface-temperature record is inflated by urban heat or data adjustments. These are secondary to the solar objection that is answered, so Minor. Confidence: Medium.

   About conclusion The finding

3. Concern (minor) Evidence is independent

   Evidence e3 and e4 cite the same two sources (IPCC AR6, National Academies); merge them or retitle e4 so it is not presented as independent.

   e3 (natural-forcing-comparison) and e4 (assessment-convergence) cite exactly the same sources, ipcc-ar6 and national-academies-climate, and e2 also cites ipcc-ar6. e4 is titled 'Independent assessments reach the same attribution', yet its own summary says the national academies use 'overlapping' evidence, and the joint academy synthesis draws on the same literature the IPCC assesses. Independent support still remains: e1 rests on direct NOAA atmospheric monitoring and e2 on the observed vertical fingerprint (NASA). So the overlap weakens, but does not collapse, the independence. Confidence: High.

   About evidence:natural-forcing-comparison, evidence:assessment-convergence, source:ipcc-ar6, source:national-academies-climate The finding

4. Pass Rates the real claim

   Claim: 'Human greenhouse-gas emissions are the main cause of the current global warming trend.' This is how the claim circulates (and how it is disputed). The conclusion stays in scope ('sustained global warming observed in recent decades'; description 'since the mid-20th century'). The title's broader 'Human activity' is consistent with the claim's thrust. Confidence: High.

5. Pass Rating follows from the evidence

   Before reading the verdict, from the evidence alone I would rate True: e1 shows measured GHG rise with isotopic fossil signature; e2 shows a greenhouse-specific vertical fingerprint (lower-atmosphere warming with stratospheric cooling); e3 shows natural drivers 'cannot account for the sustained observed warming'; e4 reports the IPCC 'human influence has unequivocally warmed'. The article's 'True' and answer 'point to human emissions as the main cause' match. Confidence: High.

Coverage: Reviewed the full article payload (claim, finding, answer, confidence, summary, keyPoints, context, conclusion, four evidence items with methods/institutions/years/limitations, two objections, method steps, sources). Per the Skeptic prompt, source snapshots were not used for this run; evidence was taken as stated. No live web.

1. Concern (minor) Verdict fields agree and stand alone

   In the conclusion, replace 'The evidence confirms with high confidence' with wording matching the True label, e.g. 'The evidence shows with high confidence'.

   Read as: FactHub rates the claim 'Human greenhouse-gas emissions are the main cause of the current global warming trend.' True (High confidence): 'Warming patterns and greenhouse-gas measurements point to human emissions as the main cause.' It reads naturally and the answer stands alone. Fields agree. However, the changelog records the label was previously 'Confirmed', and the conclusion still says 'The evidence confirms with high confidence', which is stale wording from the earlier label (rule: all fields must express the conclusion in the current label's terms).

   About conclusion The finding

2. Concern (material) Each section does its job

   Rewrite editorialNote to state scope (global mean surface warming since mid-20th century), material caveats, and review status; expand conclusion to weigh lines and unknowns.

   Rule: editorialNote states scope, material caveats, and external-review status; a missing editorial scope statement is Material. The editorialNote reads only 'This article should be revisited when major climate assessments or attribution evidence materially change.' - no scope, no caveats. Rule: the conclusion explains how the evidence fits together, weighs competing explanations and limitations, and states what remains unproven. The conclusion ('Natural influences continue to shape climate variability, but they do not explain the sustained global warming... The evidence confirms with high confidence that human greenhouse-gas emissions are the dominant cause') mentions natural influences but does not connect the measurement, fingerprint, and forcing lines or state what remains uncertain (e.g., the size of aerosol offset, regional attribution). Summary, keyPoints, and context otherwise do their jobs.

   About conclusion The finding

3. Concern (minor) Limitations are specific

   Rewrite e3's limitation to say what the forcing comparison does not prove (e.g., uncertainty in long-term solar and aerosol forcing), not just year-to-year variability.

   Rule: each item honestly lists what it does not prove, specific to the item. e1 (molecules cannot be labeled by source) and e2 (no single pattern uniquely identifies a cause) are specific. e3's limitation, 'Natural variability strongly affects individual years and regions, so short intervals can temporarily warm faster or slower than the long-term trend', is a general caveat about variability rather than a statement of what the natural-forcing comparison itself cannot establish. e4's limitation is generic to any assessment but adequate for a supporting item. Minor rather than Material because e3's limitation is not empty or boilerplate.

   About limitation:natural-forcing-comparison The finding

4. Concern (minor) Readers can verify it

   Add a method step recording limits, state the defined time period in method 1, and add stable identifiers (ISBN/DOI) for the NASA and National Academies sources.

   Rule: method steps include a precise claim definition, prioritization of evidence not resting on one source, sources reviewed, and recording of limits. Method 1 says 'Defined the time period' without stating it (imprecise), and no step records limits; steps 2-4 cover sources reviewed and prioritization. Rule: sources carry stable identifiers. ipcc-ar6 and noaa-carbon-dioxide have identifiers; nasa-climate-causes and national-academies-climate have none (the Royal Society/NAS report has a published edition that could be cited). Role labels and descriptions are meaningful. Key claims have identifiable anchors (IPCC AR6, NOAA record), so Minor.

   About method:1, source:nasa-climate-causes, source:national-academies-climate The finding

5. Concern (minor) Consistent house style

   Change 'modelled' to 'modeled' in e2, and explain 'forcing', 'stratosphere', and 'mass-balance constraints' at first use.

   Rule: American English spelling - e2 summary uses British 'modelled greenhouse influence'. Rule: technical terms a general reader would not know are explained at first use - 'forcing' (e2 title 'matches greenhouse forcing', keyPoints), 'stratosphere', and 'mass-balance constraints' (e1 limitation) are unexplained. No leftover drafting text; figures and names otherwise consistent.

   About evidence:warming-fingerprints, limitation:greenhouse-measurements The finding

6. Pass Title states the finding

   Title 'Human activity is the main cause of current global warming.' states the finding positively, names the subject, and resolves the claim without repeating a myth or loaded language (rule: lead with what is true). seoTitle 'What Is Causing Current Global Warming? Human Activity' states the finding.

7. Pass Tone is measured and respectful

   Language is measured ('point to', 'high confidence', 'cannot account for the sustained observed warming'). Objections are answered respectfully: 'That is correct, but it does not identify the cause of today’s change'; 'Models have uncertainty, especially at regional scales'. No ridicule or unjustified absolutes (rule: measured language, no dismissal of skeptics).

Coverage: Reviewed only the article payload: title, seoTitle, description, claim, finding, answer, confidence, summary, keyPoints, context, conclusion, evidence and limitations, objections, method steps, editorialNote, sources (role, title, identifier, description), image caption/alt text, and changelog. No sources or web used. Server-enforced items and the page-generated evidence map/independence note were not assessed.