The Food and Agriculture Organization of the United Nations (FAO) has been providing support to member countries on national forest monitoring for decades. Best practices and lessons learned from this support are summarized in FAO´s Voluntary guidelines on national forest monitoring (VGNFM). The guidelines provide principles, elements and best practices for the establishment and implementation of a multipurpose National Forest Monitoring System (NFMS). The aim of this paper is to strengthen the elements and guidelines provided in the VGNFM in the context of Reducing Emissions from Deforestation and Forest Degradation (REDD+). It also includes a deeper analysis of the United Nations Framework Convention on Climate Change decisions and the most recent methodological recommendations provided by the Intergovernmental Panel on Climate Change, focusing on the three pillars of an NFMS for REDD+: a Satellite Land Monitoring System, a National Forest Inventory, and REDD+ reporting, including the combination of remote-sensing and ground-based forest inventory to estimate anthropogenic forest related Greenhouse Gas emissions by sources and removals by sinks.

REDD+ is one of the leading near-term options for global climate change mitigation. More than 300 subnational REDD+ initiatives have been launched across the tropics, responding to both the call for demonstration activities in the Bali Action Plan and the market for voluntary carbon offset credits.

REDD+ must be transformational. REDD+ requires broad institutional and governance reforms, such as tenure, decentralisation, and corruption control. These reforms will enable departures from business as usual, and involve communities and forest users in making and implementing policies that a ect them. Policies must go beyond forestry. REDD+ strategies must include policies outside the forestry sector narrowly de ned, such as agriculture and energy, and better coordinate across sectors to deal with non-forest drivers of deforestation and degradation. Performance-based payments are key, yet limited. Payments based on performance directly incentivise and compensate forest owners and users. But schemes such as payments for environmental services (PES) depend on conditions, such as secure tenure, solid carbon data and transparent governance, that are often lacking and take time to change. This constraint reinforces the need for broad institutional and policy reforms. We must learn from the past. Many approaches to REDD+ now being considered are similar to previous e orts to conserve and better manage forests, often with limited success. Taking on board lessons learned from past experience will improve the prospects of REDD+ e ectiveness. National circumstances and uncertainty must be factored in. Di erent country contexts will create a variety of REDD+ models with di erent institutional and policy mixes. Uncertainties about the shape of the future global REDD+ system, national readiness and political consensus require  exibility and a phased approach to REDD+ implementation.

National information needs on forests have grown considerably in recent years, evolving from forest area and growing stock information to key aspects of sustainable forest management, such as the role of forests in the conservation of biodiversity and the provision of other ecosystem services. More recently, information on changes in carbon stocks, socio-economic aspects including the contribution to livelihoods and poverty reduction, governance and broader land use issues has become critical for national planning.

Constructive critique. This book provides a critical, evidence-based analysis of REDD+ implementation so far, without losing sight of the urgent need to reduce forest-based emissions to prevent catastrophic climate change. REDD+ as envisioned

Comprehensive, state-of-the-art IPCC report on carbon sequestration and the global carbon cycle.