Cloud Feedback

DISCLAIMER — Real, Genuinely Disputed Science, No Framework Bridge

Why no UTAC/CREP/AFET bridge: not only because the cited literature already provides the necessary quantitative structure -- a deliberate choice. This project's highly speculative AFET/UTAC experiments must never stand in the way of climate/ecology topics being accessible and usable to people who don't work inside that construct and aren't looking for renormalization groups. Real, checkable science, without the burden of an unproven framework. See PACKAGE_REGISTRY.md's "Why no UTAC/CREP/AFET bridge in the climate/ecology series" (2026-08-31) in the GenesisAeon workspace root for the full canonical note.

Status: Real, verified science with an honest, still-open scientific disagreement + NO UTAC/CREP/AFET bridge

What this is

• Real background: low marine clouds strongly cool the planet; how this
• cooling responds to warming is the leading source of uncertainty in
• equilibrium climate sensitivity (ECS), per IPCC AR6.
• IPCC AR6's own assessed ECS: best estimate 3.0°C, likely range
• 2.5-4.0°C (high confidence), very likely range 2.0-5.0°C (medium
• confidence).
• Myers et al. (2021, Nature Climate Change 11, 501-507): a real
• observational constraint on low-cloud feedback narrowing uncertainty
• toward moderate sensitivity (~3K).
• Tan et al. (2025, npj Climate and Atmospheric Science 8, article 86):
• a real, more recent finding of moderate ECS (3.63±0.98°C) arising from
• opposing mixed-phase cloud feedback mechanisms (some cloud responses
• amplify warming, others dampen it, and they partly cancel).
• **A genuine, current, unresolved disagreement, kept explicit rather than
• resolved by fiat**: separate real 2025/2026 studies using a different
• observatio

…

cloud-feedback-utac

[](https://github.com/GenesisAeon) [](https://github.com/GenesisAeon/cloud-feedback-utac/actions/workflows/ci.yml) [](https://www.python.org) [](LICENSE) [](https://doi.org/10.5281/zenodo.21780592)

GenesisAeon Package 89 — real cloud-feedback / climate-sensitivity science. Deliberately has no UTAC/CREP/AFET bridge — see DISCLAIMER.md.

For a plain-language explanation of the same topic (German, no jargon, written for general audiences), see WHITEPAPER.md.

What's real here

• IPCC AR6's assessed equilibrium climate sensitivity (ECS): best estimate
• 3.0°C, likely range 2.5-4.0°C.
• Myers et al. (2021, Nature Climate Change): observational constraint
• on low-cloud feedback narrowing toward moderate sensitivity.
• Tan et al. (2025, npj Climate and Atmospheric Science): moderate ECS
• (3.63±0.98°C) from opposing mixed-phase cloud feedback mechanisms.
• A genuine, current, unresolved disagreement: separate real
• 2025/2026 observational-constraint studies find higher sensitivity.
• Both sides are represented honestly — is_genuinely_disputed() exists
• specifically so this isn't silently resolved to a false single answer.

Quickstart

bash pip install cloud-feedback-utac

```python from cloud_feedback_utac import is_genuinely_disputed, ALL_ECS_ESTIMATES

print(f"Genuinely disputed: {is_genuinely_disputed()}") for est in ALL_ECS_ESTIMATES: print(f"{est.label} ({est.leans}): {est.citation}") ```

Development

bash pip install -e ".[dev]" pre-commit install ruff check src tests mypy src pytest

Citation

See CITATION.cff and .zenodo.json.