π° Here's your round-up of top #CarbonDioxideRemoval News / Developments from this week (09 June - 15 June 2025):
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π§΅0/17
@InSoilClimate secured its largest funding to date through a β¬100 million agreement with Key Carbon, accelerating regenerative agriculture and carbon credit generation across Europe.
Canada Nickel partnered with NetCarb to scale mineral carbon sequestration at Crawford. NetCarb's tech could boost COβ uptake 10βfold to 10β15β―Mt/year, vs 1.5β―Mt via Canada Nickel's proprietary IPT Carbonation.
@Boomitra expands to Costa Rica with a grassland project aiming to sequester 170,000β―tβ―COβ annually via regenerative agriculture and carbon finance.
Pacific Biochar partnered with Isometric to launch high-quality biochar credits, including its Humboldt Sawmill project removing 10,000+β―tβ―COβ/year.
Puro.earth opened a public consultation on a new methodology called Microalgae Carbon Fixation and Sinking Methodology for marine carbon dioxide removal (deadline: 02 July). carbonherald.com/puro-earth-staβ¦
12/17
@gosupercritical released a report with key guidelines for structuring long-term biochar offtake deals to boost market growth.
This episode dives into a radical proposal: using a buried nuclear explosion on the seafloor to break up basalt & speed up carbon removal via Enhanced Rock Weathering. The goal? Sequester 30 years of global CO2.
2/12
This episode unpacks a preprint by Hosea Olayiwola Patrick drawing lessons from COVID-19 for solar geoengineering.
π¨A new study [preprint] shows that injecting sulfur at 50km could make #SolarGeoengineering much safer.
It cools the planet more effectively, speeds ozone recovery & avoids stratospheric disruptions. This could be done using a fleet of clean, reusable H2 rockets.
DETAILSπ§΅1/10
2/ SAI involves spraying SOβ into stratosphere, where it forms aerosols that reflect sunlightβcooling Earth. It mimics volcanic eruptions like Mt. Pinatubo (1991), which temporarily cooled the planet.
But current βSAI modelsβ inject SO2 at a rate of 10 Tg/yr at ~25km altitude.
3/ But Injecting at 25 km creates problems
Aerosols accumulate in the tropical lower stratosphere, causing up to 6Β°C warming in that layer.
This disturbs jet streams, increases stratospheric water vapor, and delays the ozone layerβs recoveryβby 25β55 years in Antarctica.
π¨A new study has revealed for the first time that ancient carbon, stored in landscapes for thousands of years or more, can find its way back to the atmosphere as COβ is released from the surfaces of rivers at a rate of 1.2 billion tonnes per year.
Detailsπ§΅1/8
2/ To understand the true source of river COβ, researchers compiled a global dataset of 1,195 radiocarbon measurements of dissolved inorganic carbon (DIC), COβ & CHβ from rivers & streams.
This let them determine whether the emitted carbon was modernβor much older.
3/ Using radiocarbon signatures (ΒΉβ΄C), they found that 59% of river COβ emissions come from "old" Cβmillennia-old soil carbon & even petrogenic carbon (rock-derived, >55,000 years old)
Only ~41% came from recent biological sources like plants & microbes (decadal carbon).