This study challenges the assumption that drained organic soils always lose carbon, showing that flawed methods and inconsistent emission factors may lead to overestimated emissions. These findings are relevant for climate policy and national reporting.

Western Siberian permafrost peatlands store vast amounts of carbon and play a crucial role in global climate regulation. Based on the comparison of palaeoecological records from two microhabitats from discontinuous permafrost peatlands, the authors explore environmental shifts during rapidly changing climate conditions during the last two centuries. The study presents data from rapidly disappearing landscapes. The results emphasize the nonlinear and spatially variable nature of permafrost thaw’s impact on peatlands. Permafrost is regarded as one of the climate tipping points, and this study provides insights into potential consequences of permafrost destabilization for northern peatlands ecosystems.

This paper reports long-term metabolic shifts of a once eutrophic river based on a 32-year, high-frequency dataset from the Loire River, France. By comparing CO2 flux estimations from water chemistry data and metabolic modeling based on high-frequency oxygen measurements, the study demonstrates a metabolic shift from a eutrophic, phytoplankton-dominated regime to an oligotrophic, macrophyte-dominated regime around 2005. Building on a novel "trophlux states" framework, the analysis of this rare long-term dataset illustrates that riverine CO2 flux and its sources are dynamic within and across years, challenging the conventional understanding of simple relationships between riverine trophic status and carbon emissions.

This study provides evidence that the Sea of Marmara, a shallow shelf sea between the Mediterranean Sea and Black Sea, is on its way to becoming a "dead zone" similar to famous other examples in the Gulf of Mexico and Baltic Sea. Awareness of the large-scale formation of new oxygen-depleted zones in the ocean as a result of anthropogenic eutrophication and climate change-induced increased water columns stratification is of great importance.

Chamber-based flux measurements for carbon dioxide, methane, nitrous oxide and other climate-active gases show high temporal and spatial variability and there is a need for autonomous, simple and affordable systems. The author present such a device that can be constructed for a few thousands euros/dollars. The Pondi logger will facilitate greenhouse gas studies in remote places and will be excellent tools to involve citizens in our climate studies.

The study provides novel findings about plant strategies under very high CO2 atmospheric conditions, such as on Mars. The authors show a large increase in fruit tree water use efficiency, an indicator for how efficiently plants photosynthesize for a given amount of water supply, when the CO2 concentrations are about an order of magnitude higher than that experienced on Earth. Therefore, these fruit trees potentially can survive and grow with less water in these conditions.