This study investigates the impact of Green Human Resource Management (GHRM) practices on employees' pro-environmental behaviors (PEBs) across multiple sectors in China, including production and manufacturing, real estate, financial services, and IT industries. Data were collected from 492 participants through online and offline surveys conducted between June and August 2024, ensuring a comprehensive and representative sample. The findings reveal that GHRM significantly enhances employees' PEBs, with green mindfulness and knowledge sharing as critical mediating mechanisms. These mediators amplify the effectiveness of GHRM by fostering deeper environmental awareness and encouraging the exchange of eco-friendly practices among employees. By integrating GHRM with knowledge management processes, the study highlights how organizations can strategically leverage HR practices to strengthen their environmental performance and foster a culture of sustainability. By emphasizing the pivotal roles of green knowledge sharing and environmental awareness, this research underscores their significance in bridging the gap between organizational practices and sustainability outcomes. The insights derived contribute to advancing theoretical understanding and practical applications of green knowledge management and sustainability, offering a robust framework for businesses seeking to align their operations with global environmental goals.