The Global Comparative Study on Reducing Emissions from Deforestation and Forest Degradation (GCS REDD+) is the largest of its kind, encouraging countries to reduce their emissions in ways that are efficient, effective and equitable. For 15 years (and counting!), our researchers have worked with policymakers and forest communities to address the causes of forest-based emissions. Their work has resulted in improved monitoring, social safeguards, REDD+ policy design, and transparent emission-reduction frameworks.