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Tropical forests and peatlands provide important ecological, climate and socio‐economic benefits from the local to the global scale. However, these ecosystems and their associated benefits are threatened by anthropogenic activities, including agricultural conversion, timber harvesting, peatland drainage and associated fire. Here, we identify key challenges, and provide potential solutions and future directions to meet forest and peatland conservation and restoration goals in Indonesia, with a particular focus on Kalimantan. Through a round‐table, dual‐language workshop discussion and literature evaluation, we recognized 59 political, economic, legal, social, logistical and research challenges, for which five key underlying factors were identified. These challenges relate to the 3Rs adopted by the Indonesian Peatland Restoration Agency (Rewetting, Revegetation and Revitalization), plus a fourth R that we suggest is essential to incorporate into (peatland) conservation planning: Reducing Fires. Our analysis suggests that (a) all challenges have potential for impact on activities under all 4Rs, and many are inter‐dependent and mutually reinforcing, implying that narrowly focused solutions are likely to carry a higher risk of failure; (b) addressing challenges relating to Rewetting and Reducing Fire is critical for achieving goals in all 4Rs, as is considering the local socio‐political situation and acquiring local government and community support; and (c) the suite of challenges faced, and thus conservation interventions required to address these, will be unique to each project, depending on its goals and prevailing local environmental, social and political conditions. With this in mind, we propose an eight‐step adaptive management framework, which could support projects in both Indonesia and other tropical areas to identify and overcome their specific conservation and restoration challenges. A free Plain Language Summary can be found within the Supporting Information of this article.

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Indonesia's tropical peatlands are an ecosystem of global significance. They contain immense stores of carbon and play a key role in regional and global climate systems. They provide habitat for iconic species such as the orangutan and Sumatran tiger, and they sustain the livelihoods of thousands of local people. Despite these values, Indonesia's peatland ecosystems have been subject to extensive deforestation and degradation during the past two decades. Recurrent peatland fires related to these land use activities have caused smoke pollution across the region, resulting in substantial public health issues and political controversy. More than 50% of the nation's 21 Mha of peatland can be considered as degraded. There is an urgent need to slow the rate of peatland degradation in Indonesia and to effectively restore the vast areas already damaged. A key consideration in this challenge is that tropical peatland restoration is an emerging field of scientific inquiry and little research has been published on the factors that constitute and influence successful restoration of tropical peatland ecosystems.This thesis addresses this gap in the broader ecosystem restoration literature by focusing on a case study of the so-called "Ex-Mega Rice Project" area of Central Kalimantan (an area previously subject to extensive degradation) and examining how successful peatland restoration can be achieved in Indonesia by: (1) reviewing the drivers of peatland degradation in the country in order to better understand the competing interests and broader socioecological context in which restoration activities need to be carried out; (2) studying previous restoration initiatives in Indonesia to better understand the restoration techniques used and the factors influencing their relative effectiveness; (3) analysing the specific tropical peatland restoration technique of "re-wetting" to better understand which elements of the technique best support effective restoration outcomes; (4) analysing the specific issue of illegal oil palm development on Indonesian peatland, including a consideration of what sorts of interventions are required to halt illegal oil palm development and control the associated recurrent fires that have been shown to substantially constrain the effectiveness of restoration initiatives; and (5) presenting an overarching conceptual framework of the factors that influence effective peatland restoration, which can be used by policy makers to devise restoration interventions that should have a greater probability of success.The drivers of peatland degradation in Indonesia can be categorised as direct and indirect. Direct drivers include logging, oil palm development and recurrent fires (mostly caused by large-and smallscale land use activities). Indirect drivers include climate change, the poverty and employment needs ii of local people, and the ineffective and sometimes perversely counter-productive land use governance systems.Techniques previously used to restore peatlands in Indonesia include rewetting through ...

Of the 44 million hectares of peatland in the tropics, Indonesia has proportionately the largest area (45%) and carbon content (64%). These carbon-rich peat ecosystems play an important role in regional climate stabilization and biodiversity conservation. The Indonesian Government has enacted numerous regulatory measures since the 1990s aimed at boosting protection of the remaining intact peatland, with a threshold that peat deeper than 3 m must be conserved and cannot be cultivated. Despite these regulatory measures, extensive conversion of peatland to other land uses has occurred, especially large-scale palm oil plantation. This study shows that over 40% of palm oil plantations located in the former Ex-Mega Rice Project area (of some 1.04 million hectares) in Central Kalimantan in Indonesia are situated in deep peat areas. We estimate that continuing the present palm oil development practices on deep peat in the Ex-Mega Rice Project area will result in the release of between 93 and 217 megaton carbon dioxide equivalent (MtCO2e) over the next 25 years.

The increasing extent and frequency of fires globally requires nuanced understanding of the drivers of largescale events for improved prevention and mitigation. Yet, the drivers of fires are often poorly understood by various stakeholders in spatially expansive and temporally dynamic landscapes. Further, perceptions about the main cause of fires vary amongst stakeholders, which amplify ongoing challenges from policies being implemented inconsistently across different governance levels. Here, we develop a spatially and temporallyexplicit typology of fire prevalence across Kalimantan, Indonesia, a region with significant contribution to global greenhouse gas emissions. Based on livelihood information and data on climate, soil type and forest degradation status, we find that in intact forest the density of fires in villages that largely coincide with oil palm concessions was twice as high as in villages outside the concessions across all years. Fires occurring in degraded land on mineral soil across all years were also most prevalent in villages with industrial plantations (oil palm or timber).On the other hand, in degraded peatland, where fires are most intense during dry years induced by the El Niño episodes, occurrence rates were high regardless of village primary livelihoods. Based on these findings we recommend two key priorities for fire mitigation going forward for policy across different governance levels in Kalimantan: degraded peatland as the priority area and industrial plantations as the priority sector. Our study suggests a fire prevention and mitigation approach, which accounts for climate, land type and village livelihood, has the potential to deliver more effective means of management.