CAUCHY: Jurnal Matematika Murni dan Aplikasi
Vol 11, No 2 (2026): CAUCHY: JURNAL MATEMATIKA MURNI DAN APLIKASI

Climate Risk in ESG Portfolios: Evidence from Indonesian Equity Markets

Annisa Syalsabila (Universitas Negeri Makassar)
Nur Ikhwana (Universitas Negeri Makassar)
Lalu Ramzy Rahmanda (Universitas Negeri Makassar)



Article Info

Publish Date
30 Nov 2026

Abstract

We examine climate variables in a pipeline for dynamic Value-at-Risk (VaR) of the SRI-KEHATI ESG index and the IHSG (Jakarta Composite Index). Using 1,499 daily observations (20142025), we combine the Least Absolute Shrinkage and Selection Operator (LASSO) over 50 candidate predictors, a quantile regression neural network (QRNN) for VaR at three quantile levels, and SHAP for attribution. LASSO removes all climate variables from both indices. For IHSG, the partial correlation of clean-energy returns falls from 0.121 to 0.0005 once domestic equity factors enter, consistent with domestic absorption, though constituent overlap cannot exclude a purely compositional explanation. A diagnostic quantile regression shows climate contributions rising 2.82-fold from VaR 90% to VaR 99%, but the pattern is flat under the QRNN itself (ratio 1.03). In the main backtest, QRNN has lower pinball loss than Historical Simulation and GARCH(1,1)-t in all 12 DieboldMariano comparisons (p 0.001), although it uses same-day predictors the benchmarks lack and the advantage was not reproduced in the ablation. In a common-sample ablation (n = 249 of 300 nominal test days), LASSO pre-selection is associated with 4 of 6 Kupiec passes versus 0 of 6 without it, but IHSG still fails at two of three quantile levels. Whether SRI-KEHATI screening isolates climate risk was not tested; mediation covers IHSG only.

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Journal Info

Abbrev

Math

Publisher

Subject

Mathematics

Description

Jurnal CAUCHY secara berkala terbit dua (2) kali dalam setahun. Redaksi menerima tulisan ilmiah hasil penelitian, kajian kepustakaan, analisis dan pemecahan permasalahan di bidang Matematika (Aljabar, Analisis, Statistika, Komputasi, dan Terapan). Naskah yang diterima akan dikilas (review) oleh ...