This document discusses how human resources departments can accelerate their organizations' sustainability efforts. It argues that sustainability goals should be integrated into all employee goals and training. An essential part of sustainability is developing a culture of sustainability through values, mindsets, leadership, engagement, diversity and inclusion. HR can help by recruiting, developing and retaining talent aligned with sustainability. Leadership should work across all functions and training should embed sustainability in all roles. Building a sustainability culture requires co-creation, grassroots efforts and long-term thinking.