{ "format_version": 3, "claim_formal": { "subject": "Current global warming", "property": "primary driver is natural climate cycles (not human CO2 emissions)", "operator": ">=", "operator_note": "The claim asserts natural climate cycles are the PRIMARY driver of current warming \u2014 meaning they account for more than 50% (or more than human CO2) of observed warming. This is the disproof variant: we collect authoritative scientific sources that explicitly state the opposite \u2014 that human greenhouse gas emissions, not natural cycles, are the dominant driver. Threshold = 3 independent authoritative sources confirming this counter-position. 'Primary' interpreted as dominant/main driver contributing more than any other single factor. Sources from two independent U.S. government agencies (NOAA, NASA) plus IPCC-aligned statements.", "threshold": 3, "proof_direction": "disprove" }, "claim_natural": "Current global warming is primarily driven by natural climate cycles rather than human CO2 emissions.", "evidence": { "B1": { "type": "empirical", "label": "NOAA Climate.gov: Are humans causing global warming? \u2014 scientific consensus statement", "sub_claim": null, "source": { "name": "NOAA Climate.gov \u2014 Are humans causing or contributing to global warming?", "url": "https://www.climate.gov/news-features/climate-qa/are-humans-causing-or-contributing-global-warming", "quote": "Virtually all climate scientists agree that this increase in heat-trapping gases is the main reason for the 1.8\u00b0F (1.0\u00b0C) rise in global average temperature since the late nineteenth century." }, "verification": { "status": "verified", "method": "full_quote", "coverage_pct": null, "fetch_mode": "live", "credibility": { "domain": "climate.gov", "source_type": "government", "tier": 5, "flags": [], "note": "Government domain (.gov)" } }, "extraction": { "value": "verified", "value_in_quote": true, "quote_snippet": "Virtually all climate scientists agree that this increase in heat-trapping gases" } }, "B2": { "type": "empirical", "label": "NOAA Climate.gov: What evidence exists that humans are the main cause? \u2014 ruling out natural factors", "sub_claim": null, "source": { "name": "NOAA Climate.gov \u2014 What evidence exists that Earth is warming and humans are the main cause?", "url": "https://www.climate.gov/news-features/climate-qa/what-evidence-exists-earth-warming-and-humans-are-main-cause", "quote": "no other known climate influences have changed enough to account for the observed warming trend" }, "verification": { "status": "verified", "method": "full_quote", "coverage_pct": null, "fetch_mode": "live", "credibility": { "domain": "climate.gov", "source_type": "government", "tier": 5, "flags": [], "note": "Government domain (.gov)" } }, "extraction": { "value": "verified", "value_in_quote": true, "quote_snippet": "no other known climate influences have changed enough to account for the observe" } }, "B3": { "type": "empirical", "label": "NASA Science FAQ: Is the Sun causing global warming? \u2014 solar vs human attribution", "sub_claim": null, "source": { "name": "NASA Science \u2014 Is the Sun causing global warming?", "url": "https://science.nasa.gov/climate-change/faq/is-the-sun-causing-global-warming/", "quote": "It is therefore extremely unlikely that the Sun has caused the observed global temperature warming trend over the past half-century." }, "verification": { "status": "verified", "method": "full_quote", "coverage_pct": null, "fetch_mode": "live", "credibility": { "domain": "nasa.gov", "source_type": "government", "tier": 5, "flags": [], "note": "Government domain (.gov)" } }, "extraction": { "value": "verified", "value_in_quote": true, "quote_snippet": "It is therefore extremely unlikely that the Sun has caused the observed global t" } }, "A1": { "type": "computed", "label": "Count of verified sources rejecting natural-cycle-primacy claim", "sub_claim": null, "method": "count(verified citations) = 3", "result": "3", "depends_on": [] } }, "cross_checks": [ { "description": "Two independent U.S. government agencies (NOAA and NASA) with separate research programs both explicitly reject natural-cycle primacy and attribute current warming to human emissions.", "n_sources_consulted": 3, "n_sources_verified": 3, "sources": { "source_noaa_humans": "verified", "source_noaa_evidence": "verified", "source_nasa_sun": "verified" }, "independence_note": "NOAA (National Oceanic and Atmospheric Administration) and NASA (National Aeronautics and Space Administration) are independent agencies with separate research budgets, staff, and measurement programs. Both positions are independently consistent with IPCC AR6 findings.", "fact_ids": [] } ], "adversarial_checks": [ { "question": "Do any credible peer-reviewed papers argue that solar or natural cycles are the PRIMARY driver of recent warming (>50% attribution)?", "verification_performed": "Searched 'solar cycles primary cause global warming peer-reviewed 2020 2021 2022 2023' and 'natural climate cycles primary cause warming attribution science'. Found Connolly et al. (2023, ScienceDirect) arguing solar forcing may be underestimated and Heritage Foundation (2023) questioning temperature record reliability. Examined NASA, NOAA, IPCC, WMO, American Meteorological Society, and Royal Society positions.", "finding": "No peer-reviewed paper from a major scientific institution credibly claims natural cycles account for >50% of post-1950 warming. Connolly et al. (2023) argue for a larger-than-IPCC solar contribution but still treat it as a secondary factor; Heritage Foundation is a political advocacy organization, not a scientific institution. NASA states the greenhouse gas warming forcing is 'over 270 times greater than the slight extra warming coming from the Sun itself over that same time interval' (since 1750). This adversarial check does NOT break the proof.", "breaks_proof": false }, { "question": "Could internal variability (AMO, PDO, ENSO) account for most of the observed long-term warming trend?", "verification_performed": "Searched IPCC AR6 attribution findings on internal variability and reviewed attribution literature. IPCC AR6 SPM quantifies: natural (solar + volcanic) drivers changed temperature by -0.1\u00b0C to +0.1\u00b0C from 1850-1900 to 2010-2019; human drivers caused 0.8\u00b0C to 1.3\u00b0C (best estimate 1.07\u00b0C). Reviewed literature on AMO, PDO, and multi-decadal variability as alternative explanations.", "finding": "IPCC AR6 attributes -0.1\u00b0C to +0.1\u00b0C to natural (solar + volcanic) drivers vs 0.8\u00b0C-1.3\u00b0C to human drivers over the industrial era. Internal oscillations (AMO, PDO) produce multi-decadal fluctuations but cannot produce a sustained, monotonically increasing century-scale warming trend \u2014 they are zero-sum over long periods. Attribution studies consistently show these cannot explain the long-term trend. This adversarial check does NOT break the proof.", "breaks_proof": false }, { "question": "Is there disagreement within the scientific community about whether CO2 or natural cycles drive current warming, such that the claim could be considered contested?", "verification_performed": "Reviewed consensus surveys: Cook et al. (2013) found 97% of climate scientists endorsing human-caused warming consensus; Lynas et al. (2021) found 99.9% consensus in a literature survey. Reviewed positions of all major scientific organizations worldwide. Searched for any national academy of sciences or major meteorological organization that disputes human-forcing primacy.", "finding": "Multiple independent surveys of the peer-reviewed literature find 97-99.9% consensus that human activities are the dominant cause of recent warming. No national academy of sciences, meteorological organization, or major climate research institution supports the natural-cycle-primacy claim. The scientific debate concerns quantification details (exact percentages, cloud feedbacks, aerosol forcing magnitudes), not the direction of attribution. This adversarial check does NOT break the proof.", "breaks_proof": false } ], "verdict": { "value": "DISPROVED", "qualified": false, "qualifier": null, "reason": null }, "key_results": { "n_confirmed": 3, "threshold": 3, "operator": ">=", "claim_holds": true, "proof_direction": "disprove", "interpretation": "claim_holds=True means enough authoritative sources REJECT the claim, yielding verdict=DISPROVED." }, "generator": { "name": "proof-engine", "version": "1.0.0", "repo": "https://github.com/yaniv-golan/proof-engine", "generated_at": "2026-03-28" }, "proof_py_url": "/proofs/current-global-warming-is-primarily-driven-by-natu/proof.py", "citation": { "doi": "10.5281/zenodo.19455633", "concept_doi": "10.5281/zenodo.19454348", "url": "https://proofengine.info/proofs/current-global-warming-is-primarily-driven-by-natu/", "author": "Proof Engine", "cite_bib_url": "/proofs/current-global-warming-is-primarily-driven-by-natu/cite.bib", "cite_ris_url": "/proofs/current-global-warming-is-primarily-driven-by-natu/cite.ris" }, "depends_on": [] }