🚨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

🚨New paper argues that rejecting Carbon Dioxide Removal (#CDR) on moral hazard grounds may itself be unjust.

Using a framework of transitional justice, they propose that CDRs can, if carefully governed, form part of a just transition to a livable climate.

🧵1/9 2/ The authors note that with climate overshoot increasingly inevitable, the IPCC and Climate Overshoot Commission both view CDRs as unavoidable.

The question shifts from whether to use CDRs to how to deploy them justly.

🚨The Earth is reflecting less & less sunlight, new study reveals🚨

Satellite data show the planet is reflecting less sunlight than it used to, with the Northern Hemisphere darkening fastest.

This imbalance has big implications for climate and rainfall.🧵1/8 2/ Using 24 years of NASA’s CERES satellite data, scientists found both hemispheres now absorb more solar energy than before.

But the Northern Hemisphere has pulled ahead, darkening faster than the South.

🚨Can buildings remove CO₂ while cooling indoor air?

A new study shows that adding CO₂ capture units (#DAC) to building cooling systems can cut energy use by over 50% & remove atmospheric carbon, even in hot, humid places.

Details🧵1/10 2/ Buildings use a lot of energy. About 37% of global energy & 40% of CO₂ emissions.

Cooling is the biggest part, taking almost 40% of building electricity.

As the planet warms, cooling demand rises, creating a vicious cycle.

🚨A new study presents the 1st structural prototype of a planetary sunshade - a large space-based system at L1 designed to block some sunlight & cool Earth.

Using solar sails, deployable booms & CubeSat-based frames, it outlines a pathway for space-based #geoengineering.🧵1/11 2/ The planetary sunshade would function as a vast array of satellites at the Sun–Earth L1 point, collectively blocking ~1.8% of incoming photons - enough to reduce global temperatures by ~2 °C.

"Unlike #SAI or orbital dust, it promises uniform, reversible cooling."

🚨New Viewpoint published in Frontiers that responds to Siegert et al.’s paper.

While Siegert et al. warn against polar #geoengineering, Moore et al. argue for a compassionate harm-reduction paradigm, keeping geoengineering research open alongside decarbonization.

Details🧵1/12 2/ Siegert et al. [] critically assessed polar geoengineering proposals, urging restraint.

Their case: interventions are risky, may not work, and could distract from the essential task which is deep decarbonization.frontiersin.org/journals/scien…

🚨New Nature Geoscience study shows that blooms of Phaeocystis antarctica (microalgae) in the Southern Ocean ~14,000 yrs ago massively drew down CO₂, stabilizing climate. Their decline today could have global consequences.
#CarbonSink #CarbonDrawdown

Details🧵1/9 2/ Microalgae are pivotal in the Southern Ocean carbon cycle.

A new study from the Alfred Wegener Institute (AWI) reveals that during the Antarctic Cold Reversal (14.7–12.7k yrs BP), algal blooms slowed the rise of atmospheric CO₂.

🚨New study finds #SolarGeoengineering methods have divergent hydrological outcomes in China.

Only equatorial Stratospheric Aerosol Injection (#SAI) could mitigate the “North-Drought, South-Flood” pattern, while MCB & CCT risk worsening it.

DETAILS🧵1/11 2/ China’s hydroclimate is long shaped by the NDSF pattern: aridity in the north, flooding in the south.

Warming threatens to intensify this divide via glacier retreat and stronger monsoon variability.

How would climate interventions alter this?

🚨Researchers at the KAIST and the @MIT have developed a new fiber-based material that can capture CO2 directly from the air using only small amounts of electricity, potentially lowering the barriers to large-scale deployment of direct air capture (#DAC) technology.

DETAILS🧵1/8 2/ DAC systems, which remove CO2 directly from ambient air, have long been hindered by their high energy requirements.

With atm CO₂ concentrations at less than 400ppm, vast volumes of air must be processed, typically requiring large amounts of heat.

📝💡𝐖𝐞𝐞𝐤𝐥𝐲 𝐂𝐃𝐑 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬💡📝

📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (25 August - 31 August 2025):

🔗:

🧵0/20 Frontier signed a $31.3M deal with Planetary to scale ocean alkalinity enhancement, aiming to remove 115,211 tCO₂ at $270/t from 2026–2030.


1/20frontierclimate.com/writing/planet…

🚨In a new study published in @OneEarth_CP, researchers reveal that human land activities have stripped away roughly 24% of terrestrial carbon stocks (equivalent to 344 billion metric tons of C), underscoring an urgent need to reframe land-use & climate policy.

Details🧵1/10 2/ Plants + soils store more carbon than the atmosphere + all fossil reserves combined.

But farming, grazing, and forest use have stripped away this natural shield, turning land from a carbon bank into a carbon source.

🚨Can aeosols counter AMOC collapse?

A NEW study suggests Stratospheric Aerosol Injection (#SAI) could help prevent the decline of the Atlantic Meridional Overturning Circulation (#AMOC), but only if aerosols are injected in the appropriate latitude & hemisphere.

DETAILS🧵1/12 2/ The AMOC is a key component of Earth’s climate system, transporting heat and nutrients across the Atlantic.

Its decline, already underway, is projected to accelerate under global warming, possibly approaching a tipping point this century.

🚨Enhanced Rock Weathering (#ERW) could remove up to 700 Mt CO₂ by 2070 in the UK if quarry production scales 5–10×.

Larger extraction sites boost efficiency but raise major social, logistical & policy challenges.

A new @CommsEarth study models the trade-offs.🧵1/11 2/ ERW involves spreading crushed silicate rocks on croplands to capture CO₂.

While previous studies examined its chemistry & agronomic benefits, this work focuses on the supply chain: can the UK sustainably scale rock extraction to meet net-zero needs?

📝💡𝐖𝐞𝐞𝐤𝐥𝐲 𝐂𝐃𝐑 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬💡📝

📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (11 August - 17 August 2025):

🔗:

🧵0/19 Carbon removal company @equatic_tech raised $11.6M Series A led by Temasek Trust’s Catalytic Capital and Kibo Invest.

1/19
eco-business.com/press-releases…

🚨A new CSIRO-led study finds Australia can achieve net-zero emissions cost-effectively by 2050 if it acts early.

Rapid decarbonisation of electricity, scaled #CarbonRemoval, and strategic land offsets are central to success.

Details🧵1/9 2/ The research adapts the IEA’s global net-zero scenarios to Australia’s economy using an integrated economic–energy model.

It compares a Rapid Decarbonisation pathway, consistent with limiting warming to 1.5 °C, with a Stated Policies path leading to ~2.6 °C by 2100.

📝💡𝐖𝐞𝐞𝐤𝐥𝐲 𝐂𝐃𝐑 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬💡📝

📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (04 August - 10 August 2025):

🔗:

🧵0/18 Evero’s Ince biomass plant will be converted into the UK’s first BECCS site by 2029, capturing 217,000 t CO₂/year, processing 170,000 t waste wood, and powering 100,000+ homes.

1/18
bioenergy-news.com/news/evero-bio…

🚨New research out on US public perceptions of #SolarGeoengineering:

More Americans oppose SRM research than support it, and 1 in 5 believe government-led atmospheric modification is already underway.

DETAILS🧵1/11 2/ Using 64 interviews, 10 focus groups, and a survey of 3,076 Americans, the study found strong initial rejection of solar radiation modification (#SRM) as a research priority.

Skepticism, fear of unintended consequences, and concern over “playing God” were dominant themes.

📝💡𝐖𝐞𝐞𝐤𝐥𝐲 𝐂𝐃𝐑 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬💡📝

📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (28 July - 03 August 2025):

🔗:

🧵0/21 Germany’s 2026 draft budget allocated €111 million for negative emissions in 2026 and a further €320 million in subsequent years. A new federal department has also been set up to focus on carbon removal.


1/21linkedin.com/posts/dvne_cdr…

🚨How does #SolarGeoengineering affect air pollution & public health?

New study using a cutting-edge Earth system model shows that #SAI has only modest effects on PM₂.₅ & ozone-related mortality & these impacts are mostly due to climate shifts, not aerosol deposition.🧵1/8 2/ Using CESM2-WACCM6 simulations across three scenarios (SSP2-4.5 baseline, ARISE-SAI-1.5, ARISE-SAI-1.0), the study quantifies global mortality attributable to ozone (O₃) & fine particulate matter (PM₂.₅) under future SAI deployment targeting 1.5°C and 1.0°C warming levels.

📝💡𝐖𝐞𝐞𝐤𝐥𝐲 𝐂𝐃𝐑 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬💡📝

📰 Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (21-27 July 2025):

🔗:

🧵0/22 Chestnut Carbon secured up to $210M in non-recourse financing, led by J.P. Morgan for its afforestation project, marking a first-of-its-kind deal in the US carbon removal space.


1/22carbonherald.com/chestnut-secur…

🚨Scientists have discovered a common soil bacterium, Bacillus megaterium, that can rapidly remove CO2 from the atmosphere by transforming it into solid limestone (calcium carbonate) within 24 hours, without creating toxic byproducts.
#CDR #CarbonMineralization

DETAILS🧵1/8 2/ Microbially induced calcite precipitation (MICP) is a technique where microbes precipitate CaCO₃, often used in eco-friendly building materials.

Most MICP uses urease to break down urea, which produces ammonium, a problematic byproduct.