As of September 2011, the main global REDD database had 480 registered projects in 36 countries amounting to $3.35bn. The vast majority of these projects are on Indigenous lands and/or territories.
The scale of the REDD experiment, combined with the lack of relevant experience with REDD+ projects, has meant that projects have confronted considerable problems and delays. A recent global review of REDD+ projects noted that they face many challenges, including: criteria for sustainable forest management, monitoring, reporting and verification (MRV) of greenhouse gas (GHG) emissions, local tenure arrangements, permanence and baseline issues that can be effectively addressed only if local communities are able to properly participate in the REDD+ projects.