This report presents the key findings, good practices and recommendations of a study conducted by a group of LSE researchers, commissioned by the UNEP/OCHA Joint Environment Unit (JEU) together with the Global Shelter Cluster ECoP. The study analyzes the state of play on the adoption and implementation of environmental policies in humanitarian organizations and the extent to which environmental organizations have adopted policies related to humanitarian interventions. A key finding is that while the majority of the humanitarian organizations surveyed have or are developing environmental policies, these are often not consistently implemented, monitored and evaluated. Thus, their impact in practice remains unclear.