🚨Oceans struggle to absorb Earth's carbon dioxide as microplastics invade their waters, a new study finds.

#CarbonSink #CDR #CarbonSequestration

DETAILS🧵1/12 2/ The ocean is Earth’s largest carbon sink, absorbing vast amounts of CO₂ from the atmosphere.

But tiny plastic particles under 5 mm (microplastics) are now everywhere, from deep sea to Arctic ice, disrupting this natural system.

🚨Two recent engineering studies examine whether H2-powered aircraft can reliably deliver large payloads to the lower stratosphere for #SAI.

The papers compare a conventional tube-wing aircraft & a canard-wing alternative, analyzing design feasibility & performance limits🧵1/14 2/ Delivering aerosols to these altitudes with large payloads is difficult using existing aircraft.

Both studies explore H2 propulsion b/c it offers high gravimetric energy density & zero CO₂e, potentially enabling long-duration missions without adding direct C emissions

🚨Agroforestry can lock away carbon and boost farmer livelihoods, but weak, costly measurement blocks smallholders from #carbon markets.

A new study introduced an AI-powered, smartphone-based MRV system that accurately measures tree carbon at scale.

DETAILS🧵1/11 2/ Context: Carbon markets require precise Measurement, Reporting & Verification (MRV).

For smallholder agroforestry, traditional methods are labor-intensive, expensive & hard to scale. As a result, farmers are locked out of climate finance.

🚨Monthly Solar Geoengineering Updates (Dec Edition)

From NCAR’s possible shutdown & the Guardian’s sun-dimming debate to an African-led #SRM hub, the EU’s first governance conference & new studies, SRM dominated headlines and labs alike.

Top 10 SRM Highlights (Dec 2025)🧵1/8 1️⃣ Trump administration plans to dismantle NCAR, a leading hub for climate & SRM research

2️⃣ Guardian editorial sparks debate, warning of “sun-dimming” under political control. In response, letters argue research shutdown stifles science & misrepresents African perspectives.

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🚨What if old clothes could power cities & remove CO₂?

New study shows that modular bioenergy with carbon capture (#BECCS) using discarded textiles can cut emissions, beat landfilling on env impacts & deliver durable #CDR at costs competitive with today’s CDR markets.

🧵1/10 2/ ~92 Mt of textile waste are generated globally each year. Roughly half is biogenic (e.g., cotton), meaning it already represents stored atmospheric CO₂ captured by plants during growth.

Yet ~66% of US textiles are landfilled, releasing GHGs & pollutants over time.

🚨Can land-based and ocean-based #CarbonRemoval work together, without undermining each other?

A new Earth system modeling study shows that combining BECCS & OAE delivers near-additive CO₂ removal, cutting ~23 ppm by 2100, while exposing critical Earth-system feedbacks.

🧵1/11 2/ As emissions cuts lag, most 1.5–2°C pathways now rely on carbon dioxide removal.

But the real question isn’t which CDR method is best, it’s what happens when multiple CDR approaches are deployed together inside the real climate system.

🚨'Rock candy' technique offers simpler, less costly way to capture C directly from air

U of Toronto engineers have developed a cheap, passive, string-based #DAC system that crystallizes CO₂ like “rock candy,” potentially cutting capital costs by up to 40%.

How it works🧵1/11 Direct air capture has existed for decades, but it’s expensive. Giant fans, complex chemical plants, and energy-intensive regeneration steps drive up costs. That’s the main criticism of today’s DAC industry.

🚨🗞️Monthly Solar Geoengineering Updates (November Edition)

From the U.S. stratospheric-cooling patent to Global South funding, cautious UK–EU stances, tipping-point modeling & a surge in chemtrail chatter, #SRM captured global attention.

Top 10 SRM Highlights (Nov 2025)🧵1/6: ➡️@MakeSunsets secures its first US patent for stratospheric cooling tech

➡️Climate scientists remain skeptical of SRM, favor research over deployment, per @SZ (Garman newspaper) survey

➡️Royal Society sees SRM’s potential but stresses it can't solve climate change alone

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🚨A new modeling study finds Stratospheric Aerosol Injection (#SAI) could lower risks to many of Earth’s #TippingPoints, but not all.

High-latitude deployment best protects ice sheets & permafrost, while low-latitude deployment favors rainforests & coral reefs.

DETAILS🧵1/14 2/ Tipping elements are highly sensitive to warming.

This study analyzes how different SAI designs (equatorial, mid-latitude, high-latitude & multi-objective strategy) influence the drivers of these tipping systems under SSP2-4.5.

🚨New study reveals a major hidden C sink in the deep ocean: ancient talus breccias - piles of broken basalt formed along seafloor faults - can trap & store CO₂ for tens of millions of years, potentially offsetting a significant share of mid-ocean ridge emissions.

DETAILS🧵1/10 2/ Researchers made the discovery while drilling 60-million-year-old seafloor in the South Atlantic.

They found talus breccias containing ~7.5 wt% CO₂ - the highest carbon content ever measured in upper ocean crust, up to *40 times richer than previously sampled basalts.

🚨Soil food webs boost carbon retention in farmlands

A new study reveals that simply returning crop residues to fields can supercharge soil food webs, enabling microbes, nematodes & fungi to lock significantly more photosynthetic C into farmland soils.

Details🧵1/8 #CarbonSink 2/ Researchers from the Institute of Applied Ecology, Chinese Academy of Sciences (CAS), used field trials and ¹³C isotope tracing to map how carbon fixed by crops travels into soil and through the soil food web.

🚨New research shows how integrating Direct Air Capture (#DAC) with urea production - paired with CO₂ pricing can slash emissions, reach cost parity with fossil-based urea by 2050 & reshape global fertiliser markets through policies like the EU #CBAM.

DETAILS🧵1/9 #CDR 2/ What DAC-urea is?

It's urea fertilizer made with CO₂ pulled directly from the air instead of CO₂ from fossil fuels.

Air-captured CO₂ + green ammonia → urea.

Same fertilizer, but far lower climate impact.

🚨✨𝗛𝗮𝗹𝗳 𝗮 𝗠𝗶𝗹𝗹𝗶𝗼𝗻 𝗩𝗶𝗲𝘄𝘀!✨🚨

Our “Carbon Removal Updates Newsletter” community keeps growing, now past 𝟰,𝟬𝟬𝟬 subscribers across every continent. We’ve delivered 146+ weekly CDR updates & reached 𝟱𝟬𝟬,𝟬𝟬𝟬+ total views.

🧵1/10 2/ 𝗚𝗹𝗼𝗯𝗮𝗹 𝗥𝗲𝗮𝗰𝗵

🇺🇸United States: 33% (largest share of subscribers)

🇬🇧 United Kingdom: 13% & 🇩🇪Germany: 8% lead our European readership

🇮🇳 India: 5% tops the Asia-Pacific region

🇨🇦 Canada: 5% represents a significant share of our North American audience

🚨 The Royal Society has published a new briefing today finding that techniques to reflect a small portion of sunlight back into space (#SRM) could help lower global temperatures if deployed worldwide, but cannot replace emissions cuts or fully address climate impacts.

🧵1/7 2/ ➝ The report reviews solar radiation modification (#SRM) approaches, including stratospheric aerosol injection (#SAI) and marine cloud brightening (#MCB), outlining their potential to temporarily reduce warming and associated risks.

🚨🌲 New research reveals that even intact boreal forests, some of the planet’s strongest natural carbon sinks, lose their ability to absorb CO₂ as they age.

Here’s what the scientists found & why it matters for our climate models🧵1/9 #CarbonSink #CarbonRemoval 2/ Boreal forests cover vast regions across Canada, Russia, and Scandinavia and store enormous amounts of carbon in trees and soil.

They’re often seen as stable, long-term carbon sinks, but this study challenges that assumption with new global-scale data.

🚨A major 6-country survey (N=5,310) finds Europeans support -ve emissions to meet climate goals, but strongly prefer nature-based solutions like afforestation over engineered options like Direct Air Capture. Trust hinges on benefits for nature & future generations.

🧵1/10 #CDR 2/ When allocating how to tackle emissions, respondents clearly prioritized immediate mitigation:

• Renewables: 37.3%
• Behavior change: 24.0%
• Nuclear: 20.2%
• NETPs: 18.5%

➡️ This shows people support #CDR, but believe deep emissions cuts must come first.

🚨A new study warns that efforts to cool the planet through stratospheric aerosol injection (#SAI) could face far greater challenges than models predict, from unpredictable monsoon shifts to material shortages & engineering limits, every step adds new risks.

🧵1/8 #SRM 2/ The authors explore both micro-level (engineering) and macro-level (governance & supply) factors that could restrict feasible deployment.

Key finding: these constraints could drastically raise costs, risks, and uncertainty, especially for “solid” (non-sulfate) aerosols.

📝💡𝐖𝐞𝐞𝐤𝐥𝐲 𝐂𝐃𝐑 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬💡📝

📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (13 October - 19 October 2025):

📺:

🧵1/25 Nordbex and Aker Solutions signed an MoU to develop Bio-CCUS plants across Europe.
mynewsdesk.com/se/nordbex-ab/…

🚨Scientists built a device that captures carbon from the seawater and turns it into biodegradable plastic, using bacteria as a living bioreactor.

#CDR #mCDR #CarbonDioxideRemoval #Bioplastics

DETAILS🧵1/8 2/ The system comprises 3 components:

1️⃣ C extraction

Traditional seawater electrolysis systems often fail within hours due to mineral buildup

To solve this, researchers designed a solid-state electrolysis unit that isolates sensitive ions using membranes & a solid electrolyte

🚨French Academy of Sciences has released a new report on #SolarGeoengineering, stressing that the absolute priority must remain reducing GHG emissions via structural changes & accelerating adaptation to climate impacts.

On #SRM, the report offers several recommendations:🧵1/6 2/ SRM Recommendation 1️⃣

Promote an international agreement aimed at prohibit any initiative, public or private, to deploy SRM, regardless of the framework or scale.

To do this, the entire scientific community will have to be involved.

🚨An analysis of forest-based projects funded through the sale of #CarbonCredits shows that 10% of them may have a net warming effect on the climate because of the way they alter the Earth’s #albedo, or how much sunlight is reflected back into space.

DETAILS🧵1/12 2/ Albedo is how much sunlight Earth’s surface reflects vs. absorbs

Forests are darker than grass or snow, meaning they absorb more heat

So when grasslands or snowy areas are turned into forests, Earth’s surface can absorb more heat, partly cancelling out cooling effect of #CDR