Replication package for: "No Regime Switch, but a Robust Renewable-Energy Channel: Re-examining the FDI–CO2–Climate Policy Nexus with Search-Inflation-Aware Threshold Testing (33 OECD Economies, 1999–2019)"

Complete replication package for the study "No Regime Switch, but a Robust Renewable-Energy Channel" (Sadik, 2026). The study finds no robust climate-policy-stringency regime switch in the FDI–CO2 or renewables–CO2 relationship across 33 OECD economies (1999–2019); an apparently significant abrupt renewable-energy threshold (naive p ≈ 0.007) is shown to be a threshold-search-inflation artifact via a permutation test (empirical p = 0.158, B = 999), while a strong linear renewable-energy decarbonisation effect is robust (CCEMG t = −5.77). The package contains raw data extracts (World Bank WDI; Our World in Data CO2; OECD CAPMF LEV1_SEC), the full R pipeline (numbered scripts 01–22 with master orchestrator run_all.R, full and analysis-only modes), all output tables and figures, the saved permutation distribution, a codebook, data provenance with MD5 checksums, sessionInfo, and a verified run log. The pipeline has been independently verified end-to-end on two platforms (macOS/R 4.6; Linux/R 4.3) with cross-platform numerical agreement.