SDGBiasBench: Benchmarking and Mitigating Vision–Language Models’ Biases in Sustainable Development Goals

Zihang Lin, Huaiyuan Qin, Muli Yang, Hongyuan Zhu


Abstract
Assessing progress toward the Sustainable Development Goals (SDGs) requires multi-step reasoning over visual cues, contextual knowledge, and development indicators, where incomplete evidence use and imperfect evidence integration can introduce hidden prediction biases. Real-world SDG monitoring further spans both qualitative judgments and quantitative estimation. However, existing benchmarks typically evaluate these aspects in isolation, obscuring systematic biases that emerge when models substitute priors for evidence. To address this gap, we propose SDGBiasBench, a large-scale benchmark suite for SDG-oriented vision–language reasoning. Spanning 500k human-curated multiple-choice questions and 50k regression tasks, the benchmark enables comprehensive assessment of both decision-level and estimation-level bias in Vision–Language Models (VLMs). Evaluations on SDGBiasBench reveal an intrinsic SDG bias in current VLMs, where predictions are frequently driven by SDG specific priors rather than reliable multi-modal cues. To mitigate such bias, we propose CADE (Contrastive Adaptive Debias Ensemble), a training-free, plug-and-play method that leverages modality-specific answer priors. CADE yields significant gains on the proposed benchmark, improving multiple-choice accuracy by up to 25% and reducing regression MAE by up to 12 points across multiple VLMs. We hope our work can foster the development of more fair and reliable AI systems for sustainable development.
Anthology ID:
2026.findings-emnlp.68
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2026
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
Findings
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
1374–1394
Language:
URL:
https://aclanthology.org/2026.findings-emnlp.68/
DOI:
Bibkey:
Cite (ACL):
Zihang Lin, Huaiyuan Qin, Muli Yang, and Hongyuan Zhu. 2026. SDGBiasBench: Benchmarking and Mitigating Vision–Language Models’ Biases in Sustainable Development Goals. In Findings of the Association for Computational Linguistics: EMNLP 2026, pages 1374–1394, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
SDGBiasBench: Benchmarking and Mitigating Vision–Language Models’ Biases in Sustainable Development Goals (Lin et al., Findings 2026)
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PDF:
https://aclanthology.org/2026.findings-emnlp.68.pdf