The Grantham Foundation

Carbon Ridge develops modular onboard carbon capture and storage technology to decarbonize commercial shipping. The company provides end-to-end decarbonization for maritime vessels by enabling a fuel-agnostic approach that reduces the intensity of CO2 and other greenhouse gas emissions. Its platform aims to offer a low-cost, near-term solution for shipping operators to decarbonize fleets, allowing ships to operate with reduced environmental impact without depending on a specific fuel regime.

Allegro Energy is a developer of energy storage technology focus on sustainable solutions for a zero carbon economy.

Switch Bioworks is a biotechnology company specializing in sustainable agriculture. It produces eco-friendly nitrogen fertilizers by genetically reprogramming naturally occurring symbiotic microbes, transforming them into controlled fertilizer-producing microorganisms that benefit crops directly at the root level. This innovative approach offers farmers an affordable and environmentally responsible alternative to conventional chemical nitrogen fertilizers.

InventWood is a company focused on cellulose-based technologies and wood-derived materials. It develops cellulosic materials and high-performance, cost-effective wood products to improve thermal energy performance, energy efficiency, and environmental sustainability. Its materials are designed to be lighter for safer handling and installation, provide sunlight guiding, and offer anti-shatter properties, supporting carbon-negative construction and durable, low-impact building. Established in 2016 in College Park, Maryland by Amy Gong, InventWood seeks to advance natural, sustainable building materials for a greener future.

Applied Carbon is a company focused on developing innovative mobile pyrolysis systems that produce biochar and sequester carbon on a large scale. Their technology targets degraded or blighted lands in urban and peri-urban areas, efficiently converting on-site biomass waste into biochar, a sustainable form of charcoal derived from agricultural waste. This process not only facilitates organic waste disposal but also enhances soil health by improving nutrient and water retention and aiding in the remediation of contaminants. By trapping atmospheric carbon, Applied Carbon aims to contribute to environmental sustainability and soil regeneration while addressing the challenges posed by climate change.

Travertine is a company focused on carbon dioxide removal and industrial chemical production, aiming to mitigate the environmental impact associated with the extraction of elements for renewable energy. Utilizing a proprietary electrochemical process, Travertine converts carbon dioxide from the atmosphere into mineral forms while simultaneously producing sulfuric acid, which is essential for critical element extraction and fertilizer production. The company effectively recycles sulfate wastes to generate sulfuric acid, thereby minimizing chemical waste during these processes. Additionally, Travertine generates high-quality carbon credits through its direct air capture and mineralization efforts, contributing to a sustainable approach in mining and fertilizer industries.

ArkeaBio focuses on developing innovative technology aimed at reducing greenhouse gas emissions within the agricultural sector. The company specializes in vaccine technology that targets methane-producing microbes in livestock, effectively neutralizing these microbes to cut methane emissions from various ruminant species. By employing proven delivery systems and sustainable farming practices, ArkeaBio's solutions are designed to be applicable across diverse geographical regions and agronomic systems. This approach not only helps in mitigating the environmental impact of livestock farming but also promotes a more sustainable agricultural industry.

Ucaneo is a technology company specializing in carbon removal. It develops innovative air capture systems designed to efficiently separate and convert carbon dioxide into stable bicarbonates, supporting industrial-scale greenhouse gas mitigation.

Edacious is a Public Benefit Corporation developing a radical transparency-based food verification system. This system prioritizes food quality verification, benefiting packaged goods, retail, and supply chain industries while promoting sustainability.

Arca is a leading carbon dioxide removal (CDR) company. Arca accelerates natural process of carbon mineralization, by reacting atmospheric carbon dioxide with ultramafic mine tailings rich in magnesium silicate minerals, such as serpentine and brucite. By leveraging partnerships with mining companies, Arca transforms mine waste into a carbon sink, permanently storing CO₂ as stable carbonate minerals. The company is at the forefront of scaling carbon dioxide removal (CDR) solutions by integrating geochemical expertise, real-time monitoring, and verification methodologies. Arca collaborates with major buyers of carbon removal credits, such as Shopify, Stripe, Watershed and MaRS, and has established formal methodologies for recognizing and quantifying mineralization in voluntary and compliance carbon markets.

Founded in 2007, Ocean Rainforest cultivates seaweed on open ocean installations. It offers a range of premium, fully traceable seaweed products primarily for food and cosmetic producers, rich in beneficial nutrients like proteins, antioxidants, minerals, and polyunsaturated fatty acids.

Cache Energy develops long-duration energy storage technology based on a thermo-chemical process that provides a cleaner alternative to fossil fuels. The system enables ultra-long duration storage with near-zero loss for months and is non-toxic, non-flammable and fire-retardant to facilitate safe transportation. The technology is suitable for a wide range of industrial applications and allows energy to be held and transported to where it is needed to power demand centers.

Ebb Carbon specializes in atmospheric carbon dioxide removal via a reverse electrochemical process that enhances the ocean's natural ability to store CO2 safely while reducing acidity. This innovative approach offers potential scalability and affordability.

Eden is focused on developing a sustainable platform for natural resource recovery, aiming to create a carbon-neutral future. The company has introduced a novel method known as Pulsed Electrical Well Stimulation (PEWS), which is a patent-pending technology designed to replace traditional hydraulic fracturing. This innovative approach eliminates the need for water injection and addresses the logistical challenges and environmental risks associated with conventional fracking methods. By utilizing high-voltage electricity and proprietary modeling techniques, Eden enhances rock permeability with precision, facilitating effective resource extraction across various geological settings. This technology not only reduces costs but also minimizes the negative impacts typically associated with hydraulic fracturing, positioning Eden as a leader in environmentally responsible resource recovery.

Arca is a leading carbon dioxide removal (CDR) company. Arca accelerates natural process of carbon mineralization, by reacting atmospheric carbon dioxide with ultramafic mine tailings rich in magnesium silicate minerals, such as serpentine and brucite. By leveraging partnerships with mining companies, Arca transforms mine waste into a carbon sink, permanently storing CO₂ as stable carbonate minerals. The company is at the forefront of scaling carbon dioxide removal (CDR) solutions by integrating geochemical expertise, real-time monitoring, and verification methodologies. Arca collaborates with major buyers of carbon removal credits, such as Shopify, Stripe, Watershed and MaRS, and has established formal methodologies for recognizing and quantifying mineralization in voluntary and compliance carbon markets.

Founded in 2007, Ocean Rainforest cultivates seaweed on open ocean installations. It offers a range of premium, fully traceable seaweed products primarily for food and cosmetic producers, rich in beneficial nutrients like proteins, antioxidants, minerals, and polyunsaturated fatty acids.

nT-Tao is building a compact fusion reactor that will generate 10-20 MW of electricity. The reactor is highly scalable and will be about the size of a shipping container, ensuring clean fusion energy wherever needed. The reactor’s scalability and affordability will make it suitable for various power needs, ranging from industrial and manufacturing facilities to small towns and off-grid locations. This scalability coupled with the ability for rapid deployment, positions nT-Tao’s reactor as a versatile and adaptable fusion energy solution. nT-Tao’s unique solution relies on a proprietary plasma heating method which is expected to reach 1000 times higher density than other fusion reactors, thereby making its fusion reaction 1 million times more effective. nT-Tao’s ability for quick development iterations and its groundbreaking approach, dramatically reduces the size, cost, and complexity of fusion energy reactors. Co-founded by Oded Gour-Lavie, Doron Weinfeld, and Boaz Weinfeld, nT-Tao’s mission is to develop a unique nuclear fusion technology that will enable the world to transition towards a cleaner, decarbonized, sustainable, and advanced future.

Crosswalk Labs specializes in providing detailed and precise data on fossil fuel CO2 emissions, focusing on atmospheric calibration, spatial granularity, and temporal resolution. The company analyzes greenhouse gas emissions over time using advanced methodologies, which include scouring numerous data sources and employing constrained optimization techniques on billions of data points. This comprehensive approach allows clients to investigate the underlying causes of climate change and facilitates efficient strategies for reducing their carbon footprints. Through its innovative data solutions, Crosswalk Labs aims to contribute to climate change mitigation efforts.

Carboniferous develops technology that accelerates natural climate recovery by sequestering carbon from terrestrial biomass in marine basins. It utilizes existing supply chains to move excess biomass into anoxic zones, preventing decomposition and storing embodied carbon dioxide.

Marble is a climate tech venture studio. Our north star is to erase billions of tons from annual greenhouse gas emissions and create a thriving future. We partner with scientists, engineers and operators to create deeptech companies that can solve hard climate problems, and reshape multi billion $ industries. Together, we co-create radical solutions that slash emissions in hard to abate sectors, remove carbon from the atmosphere, and cool the planet. We shape the most promising ideas into new companies, funded by Marble. We're proud to be backed by leading climate investors across Europe and the US.

Propagate is a regenerative agriculture company focused on facilitating the integration of agroforestry systems for farmland owners. By promoting the cultivation of permanent crops alongside traditional farming practices, Propagate enhances farm profitability while improving environmental outcomes such as water quality, biodiversity, and soil health. The company offers an end-to-end solution that includes farm planning software, technical assistance, project development services, and financing programs, thereby helping farms mitigate risks associated with incorporating fruit, nut, and timber trees into their operations. Founded in 2017, Propagate’s software, Overyield, currently supports over 55,000 acres of agroforestry and has helped plan more than 3,000,000 trees and shrubs. The company actively manages over 2,400 commercial acres through its regional agroforestry hubs in New York and Kentucky and has successfully planted over 200,000 trees in the past five years. Propagate is also partnered with various organizations, including USDA programs, to further its impact in sustainable agriculture.

Banyu Carbon, established in 2022 and based in Seattle, Washington, specializes in innovative marine carbon dioxide removal. The company employs a unique photocatalytic method to harness the surface ocean as a collector for atmospheric carbon dioxide, subsequently removing and concentrating it through energy-efficient photochemical reactions. This process aims to support industries with high carbon emissions, such as power generation, in achieving their climate objectives.

Carbon Ridge develops modular onboard carbon capture and storage technology to decarbonize commercial shipping. The company provides end-to-end decarbonization for maritime vessels by enabling a fuel-agnostic approach that reduces the intensity of CO2 and other greenhouse gas emissions. Its platform aims to offer a low-cost, near-term solution for shipping operators to decarbonize fleets, allowing ships to operate with reduced environmental impact without depending on a specific fuel regime.

Carbon Counts develops Play-to-Plant games, notably EverForest, aiming to inspire individuals to combat climate change. Through engaging gameplay, users plant and grow trees in real-world ecosystems, collaborating with progressive organizations for positive environmental impact.

Travertine is a company focused on carbon dioxide removal and industrial chemical production, aiming to mitigate the environmental impact associated with the extraction of elements for renewable energy. Utilizing a proprietary electrochemical process, Travertine converts carbon dioxide from the atmosphere into mineral forms while simultaneously producing sulfuric acid, which is essential for critical element extraction and fertilizer production. The company effectively recycles sulfate wastes to generate sulfuric acid, thereby minimizing chemical waste during these processes. Additionally, Travertine generates high-quality carbon credits through its direct air capture and mineralization efforts, contributing to a sustainable approach in mining and fertilizer industries.

Banyu Carbon, established in 2022 and based in Seattle, Washington, specializes in innovative marine carbon dioxide removal. The company employs a unique photocatalytic method to harness the surface ocean as a collector for atmospheric carbon dioxide, subsequently removing and concentrating it through energy-efficient photochemical reactions. This process aims to support industries with high carbon emissions, such as power generation, in achieving their climate objectives.

Brilliant Planet develops algae-based biomass production to permanently sequester carbon at large scale using open-air pond systems on coastal desert land. The approach grows microalgae without fresh water, leveraging natural processes to sequester carbon while supporting ocean and air health, and it also provides a source of protein to meet rising demand.

Heirloom is a carbon capture company developing direct air capture technology that accelerates the natural absorption of carbon dioxide. Its approach uses a limestone-based process to increase CO2 uptake and stores the captured carbon permanently underground, powered by renewable energy. The company also applies carbon capture and utilization techniques to enhance natural CO2 removal. By offering a scalable, renewable-energy driven solution, Heirloom aims to help businesses meet sustainability goals with a cost-effective path to significant carbon removal.

Running Tide is a global ocean health company that focuses on deploying nature-based interventions to remove carbon from the atmosphere and combat ocean acidification. The company utilizes adaptive aquaculture techniques to optimize marine environments while producing healthy, low-carbon protein. Running Tide employs advanced monitoring and measurement technology, leveraging photosynthesis, ocean currents, and gravity to store carbon in the deep ocean. By analyzing ocean data, the company aims to enhance the utilization of two-thirds of the Earth’s surface in the fight against climate change, ultimately improving the health of the world's oceans.

Arca is a leading carbon dioxide removal (CDR) company. Arca accelerates natural process of carbon mineralization, by reacting atmospheric carbon dioxide with ultramafic mine tailings rich in magnesium silicate minerals, such as serpentine and brucite. By leveraging partnerships with mining companies, Arca transforms mine waste into a carbon sink, permanently storing CO₂ as stable carbonate minerals. The company is at the forefront of scaling carbon dioxide removal (CDR) solutions by integrating geochemical expertise, real-time monitoring, and verification methodologies. Arca collaborates with major buyers of carbon removal credits, such as Shopify, Stripe, Watershed and MaRS, and has established formal methodologies for recognizing and quantifying mineralization in voluntary and compliance carbon markets.

Carbon America specializes in carbon capture and sequestration (CCS), aiming to lower costs and accelerate deployment. It integrates engineering, development, and financing expertise to capture and store CO2 more efficiently than competitors.

CarbonBuilt is a clean technology company focused on carbon capture and utilization within the concrete industry. The company has developed innovative technologies aimed at significantly reducing carbon emissions associated with concrete production. Its flagship product, Reversa® Binder, serves as a low-carbon alternative to traditional cement, allowing for the creation of concrete with a markedly lower carbon footprint. By directly injecting carbon dioxide emissions from industrial sources into proprietary low-carbon concrete formulations, CarbonBuilt enables base industries to effectively reduce greenhouse gas emissions while producing materials that conform to industry standards.

Vibrant Planet is a company focused on enhancing land management through innovative technology solutions aimed at accelerating land restoration efforts. Founded in 2004 by Allison Wolff and headquartered in Incline Village, Nevada, the company develops a cloud-based planning and monitoring tool that assists communities and ecosystems in adapting to climate change. By collaborating with scientists, land management professionals, and policymakers, Vibrant Planet creates a platform that facilitates collaborative planning and informed decision-making. Their technology is designed to help save lives, prevent infrastructure loss, and restore natural systems that provide essential services such as carbon storage, clean water, and biodiversity support, ultimately fostering a more resilient and equitable future for society.

Infinium produces synthetic fuels from renewable energy and waste carbon dioxide, offering a lower-carbon alternative for transportation systems and chemical processes like plastics production.

Carbon Counts develops Play-to-Plant games, notably EverForest, aiming to inspire individuals to combat climate change. Through engaging gameplay, users plant and grow trees in real-world ecosystems, collaborating with progressive organizations for positive environmental impact.

nT-Tao is building a compact fusion reactor that will generate 10-20 MW of electricity. The reactor is highly scalable and will be about the size of a shipping container, ensuring clean fusion energy wherever needed. The reactor’s scalability and affordability will make it suitable for various power needs, ranging from industrial and manufacturing facilities to small towns and off-grid locations. This scalability coupled with the ability for rapid deployment, positions nT-Tao’s reactor as a versatile and adaptable fusion energy solution. nT-Tao’s unique solution relies on a proprietary plasma heating method which is expected to reach 1000 times higher density than other fusion reactors, thereby making its fusion reaction 1 million times more effective. nT-Tao’s ability for quick development iterations and its groundbreaking approach, dramatically reduces the size, cost, and complexity of fusion energy reactors. Co-founded by Oded Gour-Lavie, Doron Weinfeld, and Boaz Weinfeld, nT-Tao’s mission is to develop a unique nuclear fusion technology that will enable the world to transition towards a cleaner, decarbonized, sustainable, and advanced future.

AgriProve is an agri-tech company focused on soil management. It offers a next-generation soil measurement platform designed to enhance productivity and generate carbon credits. The company aims to transform agriculture by unlocking the carbon potential in soil, while providing information about associated costs and risks.