⏳ Years of negotiation, advocacy & collaboration have led to this historic moment! The #HighSeasTreaty is now in force, a testament to the leadership of governments, civil society, Indigenous leaders, scientists & many more ocean champions everywhere. #60toGlobal @highseasalliance.bsky.social#HighSeasTreaty

📣 Call for Abstracts for ICOS Science Conference 2026 is now open! Deadline for submissions is 6th March 2026, 15:00 CET. Submit your abstract: https://www.icos-cp.eu/news-and-events/news/call-abstracts-icos-science-conference-2026-now-open #ICOS2026SC

3 tropical cyclones devastated the Indian Ocean nations within a week, exposing how warming seas have amplified regional vulnerability. Slow government responses and limited international attention deepen the crisis for communities least responsible for #ClimateChange. @rochmyaningsih.bsky.social#ClimateChange

December 2025 was the 5th warmest December on record globally. This month was about 1.42°C above the 1850-1900 pre-industrial average. Note the sharp temperature anomaly contrast across North America! Summary of month from @copernicusecmwf.bsky.social: climate.copernicus.eu/surface-air-... 🌊🧪⚒️

🪸 Coral reefs are already under severe stress. 2026 is seen as a key year of risk, with the return of El Niño. With less time to recover, another prolonged warming phase could trigger extensive collapse across many regions. #ClimateChange #CoralReefs @pml.ac.uk#ClimateChange

As part of the celebrations for #WorldGlaciersDay, @unesco.org#WorldGlaciersDayis calling for side-events at its HQ in Paris on 19–20 March 2026. If you are interested, send your expression of interest by Jan 30 👉 https://www.unesco.org/en/articles/call-expressions-interest-world-day-glaciers-2026

🌡️ A new global temperature record (GloSAT) (observing marine air temperatures back to the 1780s) gives a longer, more complete view of how ocean and land temperatures have changed over time, including by the influence of natural drivers and human activities. @colinmorice.bsky.social @edhawkins.org

Planning to attend #EGU26? Interested in the impacts of AMOC weakening? New session alert! 🚨🌊🧪 ITS2.5/CL0.5: "AMOC impacts: physical, biogeochemical, and societal" Check out our interdisciplinary session description & submit your abstract here: meetingorganizer.copernicus.org/EGU26/sessio...

‘Profound impacts’: record ocean heat is intensifying climate disasters, data shows www.theguardian.com/environment/... 🦑🌎🧪

In the Med & Black Seas, prioritising shark & ray nurseries, feeding grounds + routes (ISRAs) picks roughly the same total area for protection but shields more threatened species. Authors show practical ways to cut costs with smart choices. #Sharks @cp-iscience.bsky.social @iucnshark.bsky.social

#MPAs can support post-disturbance recovery under climate stress. After the 2014-2016 marine heatwaves, kelp in Californian MPAs was about 8.5% higher after protection. The message is clear: protection can help kelp recover as the climate warms. @uclalibrary.bsky.social#MPAs

In Cyprus🇨🇾, scientists used a simple scorecard to decide which ghost nets to remove, to avoid tearing out those that have become valuable habitat. This method allowed divers to remove ~3 km of the worst nets, cutting hazards to wildlife and people while avoiding extra damage to fragile reef life.

A new deep-learning ocean model (ORCA-DL) predicts global currents and temperatures months to years ahead. It beats many physics-based models on El Niño and marine heatwaves, works below the surface, and runs stably for a decade, though long-lead cold biases remain.

Thirty years of in situ observations indicate that a vital ocean current is losing its chill, transporting warmer water to the Arctic. 🌊🧪 ocean2climate.org/2026/01/05/a...

#OceanAcidification + warming (two of the main consequences of #ClimateChange) can simultaneously affect the structure, mineral composition, and microbiome of bryozoans, colonial invertebrates crucial for forming marine habitats, shrinking colonies & increasing dead tissue. @icmcsic.bsky.social

From the first sighting of a colossal squid in the wild to a seriously goofy octopus, 2025 delivered some astounding photos from the ocean’s depths

Six years ago, when #COVID19 hit Hanauma Bay on Oʻahu, Hawaii, nature was born again. A study calls for visitor management that balances reef tourism with ecological preservation. https://www.nature.com/articles/s44183-025-00144-3

What triggers Mediterranean #MarineHeatwaves? This year's research found that when high-pressure ridges park overhead and winds drop; with less evaporation, the sea warms fast. This wind-and-ridge combo boosts heatwave odds severalfold and gives a short early-warning window for forecasters.

While the International Year of Glaciers' Preservation comes to an end, a study finds buoyant meltwater plumes from Greenland's most active glacier boost summer primary production by up to 40%. This lifts annual CO₂ uptake by only about 3%, as warmer upwelled waters hold less gas. #IYGP2025

Season's Greetings from the ocean! 🌊🎄 Many marine species display colours, patterns and forms that echo the winter season: https://ocean.si.edu/ocean-life/fish/happy-holidays-ocean @smithsonianmag.bsky.social 📷 Christmas Tree Worms photographed by Nick Hobgood @amphibiologist.bsky.social

Most #BlueCarbon in mangrove, saltmarsh and seagrass soils comes from elsewhere (drifting seaweed, plankton and land plants), not just the local vegetation. Authors of this study outline a roadmap to improve tracing and seascape-wide management to protect and enhance this coastal carbon storage.

🪱 Trawl and DNA surveys along Japanese and Kuril–Kamchatka trenches uncovered 30 #deepsea ribbon-worm species. 23 taxa appear undescribed, dramatically expanding knowledge of their diversity and distribution. https://www.sciencedirect.com/science/article/pii/S0967063725001074

Mesopelagic fishes, found in the deep sea, produce and excrete intestinal carbonate at rates expected from size and temperature, confirming their role as major carbonate sources at depth, with implications for the global #CarbonCycle. https://www.sciencedaily.com/releases/2025/07/250726234426.htm

Recent research reveals that deep-sea mining could dramatically threaten 30 species of sharks, rays, and ghost sharks whose habitats overlap with proposed mining zones, further endangering species already at risk of extinction. Read more in Science Daily: https://ow.ly/CtSN50XG94U

🌡️ New temperature records show the East #Antarctic interior is warming rapidly, especially from October to March. This is linked to rising sea temperatures in the southern Indian Ocean, highlighting how remote ocean changes can drive polar climate shifts. #ClimateChange @en.nagoya-u.ac.jp#Antarctic

My pick of a Top-10 list of insightful climate science papers of 2025. It’s been a very busy year with a huge amount of top quality, well considered and executed, peer reviewed research. drtomharris.substack.com/p/my-top-10-... #climatechange #research #globalwarming

#COP30 delivered climate finance and adaptation progress but no #FossilFuel phase-out plan, leaving ambition far behind science. Here are some of the outcomes from the UN climate summit in Belém, Brazil. Editorial by @meghier.bsky.social and @jeff-tollefson.bsky.social#COP30↩️ #ClimateScience

🌊 Scientists document 60 years of ocean change: compound changes in ocean temperature, salinity, oxygen and pH have already emerged across much of the global ocean, intensifying with depth and clustering in key ecological and economic regions, including high-seas carbon sinks and major fisheries.

Today marks 10 years since the #ParisAgreement. With 2024 as the hottest year yet, both 1.5°C & 2°C goals are at risk. @natsustain.nature.com#ParisAgreementurge a shift from negotiation to implementation. Clean energy investment remains at the top of commitments, and social responsibility gets recognised. ↩️

A record #MarineHeatwave in 2024 wiped out most fire coral across US Virgin Islands reefs. Once dominant & considered resilient, 𝘔𝘪𝘭𝘭𝘦𝘱𝘰𝘳𝘢 suffered massive mortality, pushing reefs further toward algal dominance & weakening future recovery prospects. https://www.pnas.org/doi/10.1073/pnas.2518506122

A new AI method maps coastal CO₂ exchange globally by combining satellite data and millions of field measurements. This approach fills key data gaps, improving climate models and our understanding of the coastal ocean’s role in the carbon cycle. #CCS @roobaertalizee.bsky.social#CCS

Rising CO₂ + ocean acidification could reshape #CoralReefs worldwide. From rich, complex ecosystems to simpler, algae and rubble-dominated seascapes, this suggests that many global reefs may lose their structural complexity, biodiversity & capacity to support marine life. @fab-coral.bsky.social#CoralReefs

Caribbean reefs have lost 48% of hard coral since 1980, study finds: ‘Destructive’ marine heatwaves driving loss of microalgae that feed coral, says Global Coral Reef Monitoring Network Caribbean reefs have half as much hard coral now as they did in 1980, a study has found. The 48% decre...

#SeaLevelRise won’t be the same everywhere. New study led by @scienceshaina.bsky.social#SeaLevelRiseshows melting Antarctic ice will raise sea levels more in distant coastal regions and island nations than near Antarctica itself, due to changes in gravity and ocean redistribution. #ClimateScience

🌊 The Arctic is changing fast. Retreating sea ice and warmer Atlantic waters are shifting north, boosting dense water formation. This helps keep the Atlantic Meridional Overturning Circulation (#AMOC) flowing, even as other regions slow down. #ClimateChange

#WorldWildlifeConservationDay is a reminder that protecting ocean life is essential to planetary stability. 🦈 #Sharks are declining due to overfishing, illegal trade, and habitat loss. Many species now sit at the brink, despite their critical role in maintaining balanced, functioning food webs.

#MarineHeatwaves can disrupt organism development by altering the time between life stages. Even moderate but prolonged heat can shift the timing of key life stages, risking failed reproduction and population decline. @sosbangor.bsky.social @awi.de#MarineHeatwaves

Seabirds can help support #CoralReef biodiversity and resilience. Nutrient inputs from seabirds affect the feeding strategies and physical traits of reef fishes, enriching reef waters with nitrogen and phosphorus. @lljeannot.bsky.social#CoralReef https://royalsocietypublishing.org/doi/10.1098/rspb.2025.0539

Antarctica remains one of Earth's last wilderness areas, but it is under increasing pressure from human activities. On #AntarcticaDay, a few scientific studies remind us of the importance of urgent protection for this fragile continent. 🧵 📷 Kimberley Collins

🌊 This #BlueFriday, we’re choosing to value what truly sustains us: the ocean. Today is a reminder that healthy seas regulate our climate, generate oxygen, and support life on Earth. Protecting the ocean is essential for a stable planet. #OceanConservation #BluePlanet

Global ocean governance could benefit from giving non-state actors a stronger role in international rule-making, this study states. The IUCN is a case study of an active contributor to shaping ocean law by bridging governments and civil society, but it lacks effectiveness and enforcement power.

#PlasticPollution has reached every corner of our planet. Even remote areas like the Chagos Archipelago and Madagascar show contamination, revealing the widespread nature of marine plastic pollution. @margotthb.bsky.social#PlasticPollution https://www.nature.com/articles/s41598-025-02893-0

Antarctica’s melt affects everybody but won’t hit every coastline the same. New maps show where seas could rise the fastest, and why millions of coastal residents should pay attention now 🌊

2025 is the International Year of Glaciers’ Preservation. Authors call for urgent, collaborative action to preserve glaciers, highlighting their scientific, cultural and spiritual importance, urging integration of traditional knowledge into climate efforts. #Glaciers2025 #IYGP2025

#CITESCoP20 opens today in Samarkand, a key moment for ensuring wildlife use is sustainable, legal and safe. Progress here is essential for achieving Target 5 of the #KMGBF and protecting species and communities that depend on them.

Remember the 2007–2008 breakups of the Wilkins and Voyeykov shelves in #Antarctica? A study reveals that large-scale calving events in Antarctic ice shelves are preceded by prolonged amplifications in flexural stress, driven by ocean swell and reduced sea-ice barriers.

🪸 #CoralReefs can help reconstruct continuous #SeaLevelRise. Scientists found corals in the central Indian Ocean recording sea-level rise from 1930 to 2019 and showing an acceleration mid-century. https://www.nature.com/articles/s41467-025-60972-2

#IllegalFishing detection is low across Chile’s fisheries supply chains. A study finds that targeting upper-chain actors like processors improves detection and recommends smarter enforcement strategies to strengthen fisheries sustainability. #WorldFisheriesDay

A weakened #AMOC could trigger #SouthernOcean warming and reduce Antarctic sea ice within decades. Model results show regionally significant changes, driven by increased heat transport and a new tropical–Antarctic atmospheric link. @bas.ac.uk#AMOC

If we don't rapidly phase out fossil fuels, we can say goodbye to coral reefs, the Greenland and Antarctic icesheets, and permafrost. The results will not be pretty.