Integrating economic methods and tools into climate and environmental decision-making is necessary for crafting effective policies. Although the need for multi-disciplinary and holistic approaches to tackle climate, biodiversity, and environmental challenges is increasingly being recognised, a significant share of research and decision-making still focuses on either economic, environmental, biodiversity, or climate problems. This highlights the need for tailored and targeted stakeholder engagement methods to engage relevant experts during decision-making processes. DECIPHER has been developing a holistic approach to tackling problems exactly at this nexus. Consequently, engaging stakeholders in DECIPHER has been essential to ensure that climate modelling outputs are useful for policymakers designing and implementing climate, biodiversity, and environmental policy. This report has a two-fold purpose: 1) highlighting what relevant insights were obtained for DECIPHER and how the content of the modelling work implemented in DECIPHER has utility for decision-making, and 2) general lessons for engaging stakeholders in research and decision-making processes.