This Guidebook supports FBOs to identify, measure, monitor, and reduce the greenhouse gas emissions of their operations including energy consumption, mobility, heating, and cooling. It explains how to identify relevant physical assets (i.e., buildings, vehicles), compile a greenhouse gas inventory, set a science-based target, share the inventory and target with the SBTF project using the survey tool, track and communicate progress on emissions reductions, and strive for net zero emissions by 2050. Driven by values-based principles, FBOs are uniquely positioned to advance climate mitigation efforts and inspire action by local communities around the world.