The article discusses challenges and lessons learned in financing efforts to reduce deforestation in developing countries, known as REDD+. The researchers reviewed existing literature to understand the obstacles in securing funding for REDD+ projects under the UNFCCC and outside of it. They found that while public finance is crucial for UNFCCC-aligned REDD+ efforts, engaging the private sector is key for projects outside the UNFCCC. Common challenges include the need to connect REDD+ with other environmental goals and to establish effective learning systems for REDD+ finance.