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Fast-growing trees (FGTs) are increasingly utilized as woodchips for bioenergy in Thailand. However, a comprehensive sustainability assessment requires the simultaneous evaluation of greenhouse gas emissions and water scarcity impacts across the supply chain. This study quantified and compared the cradle-to-gate carbon and water footprints of woodchip supply chains for Eucalyptus camaldulensis ( E. camaldulensis ) and Acacia hybrid ( A. hybrid). Two distinct processing and logistical configurations were considered: (i) an in-field brush chipper (BC) with chip transport, and (ii) a centralized industrial wood chipper (IWC) with whole-tree transport. Life cycle assessment (LCA) was performed in SimaPro v10.2.0 using ReCiPe 2016 Midpoint (H) v1.08 with Ecoinvent v3.11, and water footprint was assessed using the Hoekstra water scarcity method with a functional unit of 1.0 GJ delivered as woodchips. At 90 km transport, the carbon footprint ranged from 480 to 1400 g CO 2 -eq/GJ, with E . camaldulensis consistently lower than A. hybrid, and BC substantially lower than IWC for both species. The water footprint was dominated by plantation green water and showed little sensitivity to chipper choice, averaging 74.4 m 3 H 2 O-eq/GJ for E . camaldulensis and 88.8 m 3 H 2 O-eq/GJ for A . hybrid. The carbon footprint was primarily driven by diesel-intensive chipping in BC, whereas it was dominated by the transport of whole trees in IWC. These results highlight that logistics and chipping technology selection are critical levers for reducing carbon footprints, while species primarily govern scarcity-weighted water use. Sensitivity screening of land-use change and soil organic carbon (LUC-SOC) indicated that the sign and magnitude of land-related GHG fluxes depend on baseline land cover and the assumed amortization period and can materially influence net cradle-to-gate climate-change results. The findings provide valuable insights for policymakers and stakeholders in advancing sustainable bioenergy development. • Carbon and water footprints of woodchip production supply chains from fast-growing trees were considered. • Eucalyptus camaldulensis showed lower carbon and water footprint than Acacia hybrid across all scenarios. • High water footprint was dominated by plantation green water and insensitive to chipping technology.