General
Towards a modular multi ecosystem monitoring, reporting and verification (MRV) framework for soil organic carbon stock change assessmentBackgroundSoils store roughly 1,500–2,400 petagrams (Pg) of organic carbon globally, more than the combined carbon in the atmosphere and vegetation, making soil organic carbon (SOC) a critical component of climate mitigation and land degradation neutrality targets. Many initiatives assume that relatively small annual increases in SOC across large areas could offset gigatonnes (Gt) of CO2, but these claims require robust, comparable monitoring systems. Current MRV approaches often focus on single sectors and use heterogeneous methods, limiting their usefulness for cross-ecosystem accounting and results-based finance. Open access copy available |
The Evolution of Carbon Market: A Systematic Review and Bibliometric StudyBackgroundCarbon markets are now central to climate policy because governments increasingly rely on carbon pricing to align economic decisions with emission reduction targets. As emissions trading systems and carbon taxes expand in scope and scale, policymakers and researchers need a clear picture of how underlying scholarship has developed and where knowledge gaps remain. Literature on carbon markets has grown rapidly, spanning multiple disciplines, making it difficult to track dominant themes, influential contributions, and blind spots, especially around equity, governance, and Global South experiences. Open access copy available |
Overestimated natural biological nitrogen fixation translates to an exaggerated CO2 fertilization effectBackgroundBiological nitrogen fixation (BNF) supplies a substantial fraction of reactive nitrogen of ecosystems, typically estimated in the tens to over 100 Tg N yr⁻¹ globally, thus constraining how strongly plants can respond to rising CO2. Many Earth system models (ESMs) parameterize BNF such that nitrogen does not strongly limit CO2 fertilization, potentially inflating modelled land carbon sinks and underestimating future atmospheric CO2 concentrations. Quantifying this bias is important for realistic carbon budget and mitigation assessments. Open access copy available |
The construction of biodiversity in conservation policy discourse: A multiscalar analysisBackgroundOpen access copy available |
Emerging climate impact on carbon sinks in a consolidated carbon budgetBackgroundOpen access copy available |
Realizing the social value of impermanent carbon creditsBackgroundNature-based solutions (NbS) for carbon sequestration provide additional benefits outside of climate change mitigation, such as protecting biodiversity and local livelihoods. However, NbS projects struggle with financing due to challenges demonstrating additionality, avoiding overestimation of carbon storage, establishing metrics to compare NbS with technological projects, and accounting for project impermanence (i.e., the future risk of carbon being released into the atmosphere due to fires, deforestation, disease, or severe weather events). Open access copy available |
Enhancing climate change mitigation in protected areasBackgroundProtected areas (PAs) cover roughly 15–17% of the Earth’s land surface and contain a large share of remaining intact ecosystems, many of which store high densities of carbon. With global terrestrial ecosystems absorbing about 3 GtC yr⁻¹, understanding how much of this sink is associated with PAs is important for integrating biodiversity and climate strategies. However, evidence on PA effectiveness for carbon protection, across thousands of sites and multiple biomes, is dispersed and unevenly synthesized. Open access copy available |
Global Carbon Budget 2023Background“Global Carbon Budget 2023” extends this annual budget series with data up to 2022 and a projection for 2023, including for the first time explicit treatment of carbon dioxide removal (CDR) and new constraints from atmospheric oxygen measurements. Atmospheric CO2 averages 417.1 ± 0.1 ppm in 2022 and is projected to reach about 419.3 ppm in 2023, reflecting continued net accumulation despite temporary pandemic-related emission reductions. Open access copy available |
Global Carbon Budget 2022Background“Global Carbon Budget 2022” extends the series of budgets to 2021 with a projection for 2022, documenting that fossil carbon dioxide (CO2) emissions likely surpass pre-COVID pandemic levels. Atmospheric CO2 growth remains high, with decadal mean growth around 5.2 GtC yr⁻¹ for 2012-2021 and concentrations exceeding 414 ppm. Open access copy available |
Global Carbon Budget 2021Background“Global Carbon Budget 2021” updates the budget to 2020 and projects 2021, analyzing the rebound of carbon dioxide (CO2) emissions after the initial downturn during the COVID-19 pandemic. Atmospheric CO2 continues to increase, with decadal mean growth reaching ~5.1 GtC yr⁻¹ for 2011–2020 and concentrations surpassing 412 ppm. Open access copy available |
