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Aerial view of the Bełchatów power station in Poland, with its industrial buildings and tall chimneys.Climate · Nov 12, 2026Climate: why current policies lead to 2.7 °C in 2100The Climate Action Tracker estimates that current policies are associated with warming of 2.7 °C by 2100. Lower scenarios depend on additional commitments and their implementation.Permafrost ice exposed by erosion on the bank of Birch Creek, Alaska.Climate · Nov 6, 2026Arctic methane: why estimates are not yet telling the same storyThe AMPAC-Net review highlights a gap between two methods of estimating emissions. Understanding this difference means distinguishing stored carbon, released gases and measurements in the atmosphere.Aerial view of Heimdal Glacier and snow-covered terrain in eastern Greenland, illustrative photograph.Climate · Nov 6, 2026In Greenland, a lake beneath the ice delays the release of meltwaterBeneath Flade Isblink, an invisible reservoir fills in summer and empties mainly in autumn. Satellites reveal why the date of melting alone is not enough to predict when water will arrive downstream.The Aletsch Glacier and its neighbours in the Swiss Alps, seen by Landsat 8 on 6 August 2024.Climate · Nov 1, 2026Retreating glaciers: what a map cannot tell a walkerMaps record the retreat of glaciers, but do not describe conditions on the day. From measuring climate change to unstable terrain and route planning, here are the key distinctions to bear in mind.Lenticular clouds over Mount Rainier in the United States, photographed in 2011. An illustrative atmospheric landscape, unrelated to the 2025 CO₂ readings.Climate · Oct 27, 2026CO₂ record in 2025: why the atmosphere continues to accumulate greenhouse gasesThe WMO reports a new record for CO₂, methane and nitrous oxide in 2025. What concentrations actually measure and what NOAA’s independent readings show.Light shimmering beneath the turquoise surface of seawater, an illustrative photograph of the marine environment.Climate · Oct 26, 2026How shells preserve traces of the marine climateGrowth lines, isotopes and chemical analyses: researchers use shells as ocean archives, while taking care not to confuse local signals with the global climate.A heavily bleached, very pale coral surrounded by other formations on an underwater reef.Nature and environment · Oct 26, 2026Bleached corals and jellyfish: how to read the signs of an ocean in changeNOAA confirms the scale of heat stress on reefs, but jellyfish blooms do not follow a simple global pattern. Scientists explain why.Satellite view of the Barnes Ice Cap: bright ice crossed by channels, surrounded by brown land and lakes.Climate · Oct 26, 2026Barnes Ice Cap: why researchers speak of an interrupted glaciationPlants preserved beneath the ice trace an ancient advance, followed by a retreat. The finding sheds light on a slow process, without heralding an imminent deep freeze.Atlantic waves raised by the wind in a golden lightClimate · Oct 2, 2026Oceans: what August’s heat record measuresCopernicus recorded an average of 21,07 °C at the ocean surface outside the polar regions in August 2026. This record, shared with March 2024, is based on ERA5; other datasets do not give it the same ranking.White foam and turquoise waves seen from aboveClimate · Oct 1, 2026El Niño 2026–2027: reading the forecast at the right scaleThe WMO expects El Niño to strengthen and persist until February. This global climate signal does not, on its own, describe the winter in store for Luxembourg.