Abstract

Purpose: Organizational sustainability depends critically on employees' voluntary pro-environmental conduct, yet the psychological and behavioral mechanisms through which environmental awareness converts into workplace environmental citizenship behavior (WECB) remain theoretically underspecified. This study examines sustainable consumption behavior as a mediating mechanism and biospheric values as a moderating boundary condition within the environmental awareness-WECB relationship, grounded in the value-belief-norm theory and norm activation model. Method: A structured survey was administered to 234 full-time employees. Validated scales were adopted for all four constructs. Mplus was employed for structural path analysis, including sequential mediation testing and hierarchical moderation regression with mean-centered interaction terms. Findings: Environmental awareness significantly predicted both WECB (β = 0.664) and sustainable consumption behavior (β = 0.679). Sustainable consumption behavior partially mediated the environmental awareness-WECB relationship (indirect effect = 0.511; 77.0% of total effect), consistent with a spillover mechanism. Biospheric values negatively moderated the sustainable consumption behavior-WECB path (β = -0.107), revealing a ceiling moderation pattern absent from prior literature. Originality/Implications: This study is the first to jointly test sustainable consumption behavior as a behavioral bridge and biospheric values as a dispositional boundary condition in the environmental awareness-WECB chain. The findings extend value-belief-norm theory into the organizational domain and offer actionable guidance for sustainability-oriented human resource management.