The Grantham Foundation

Vema Hydrogen is a trailblazing company specializing in clean hydrogen production. It tackles the global challenge of decarbonization by generating hydrogen through geologic stimulation, offering a clean and cost-effective alternative to traditional methods. The company employs advanced numerical simulations, geochemical analysis, and multiphase flow studies to optimize hydrogen production. It also identifies and tests suitable geological locations for pilot projects, obtains necessary permits, and optimizes catalyst use to enhance efficiency.

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.

Paebbl is a carbon storage company that uses mineralization technology to convert carbon dioxide captured from industrial facilities or the atmosphere into carbon-negative materials for construction and other products, such as paper. The process aims to be energy efficient to enable scalable production of carbon-negative materials and lower net emissions. Paebbl was founded in 2021 by Pol Knops, Jane Walerud, Marta Sjögren, and Andreas Saari.

Hephae Energy Technology develops an integrated drilling system that enables the safe, efficient, and cost‑effective extraction of geothermal energy. The company’s technology harnesses abundant heat resources worldwide, providing a new generation of drilling solutions that improve accuracy, safety, and productivity for geothermal wells.

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

Renewable Metals is a company that specializes in recycling end-of-life batteries. It employs a proprietary process to recover nearly all the lithium, nickel, cobalt, copper, and manganese from these batteries, ensuring minimal waste. This service enables clients to produce new batteries using recycled materials, thereby reducing waste and promoting sustainability.

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.

Yama specializes in developing innovative direct air capture technology, focusing on high scalability and low energy consumption. Its novel hybrid electrochemical process aims to surpass current limitations in electricity, land, water, and manufacturing, offering clients affordable access to energy-efficient solutions.

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.

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.

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.

Renewable Metals is a company that specializes in recycling end-of-life batteries. It employs a proprietary process to recover nearly all the lithium, nickel, cobalt, copper, and manganese from these batteries, ensuring minimal waste. This service enables clients to produce new batteries using recycled materials, thereby reducing waste and promoting sustainability.

Atlas is a process to create carbon negative materials for industry use.

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.

Avalanche Energy develops compact fusion reactors for distributed energy applications. Its modular reactor design enables clean energy production with high energy density, facilitating decarbonization efforts.

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.

Founded in 2019 by renowned fusion scientists and business leaders, Type One Energy is dedicated to delivering sustainable and affordable fusion power globally. The company employs advanced manufacturing methods, computational physics, and high-field superconducting magnets to develop its optimized stellarator fusion energy system. Its FusionDirect program aims for a low-risk, efficient path to a fusion power plant within the next decade.

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.

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.

Summit Nanotech Corporation is a Calgary-based cleantech company developing direct lithium extraction technology for lithium producers, with modular systems designed for scalable deployment and a focus on sustainable, water-efficient operations. Founded in 2018, it collaborates with mining companies and lithium asset owners in Chile and Argentina to reduce environmental impact and lower costs compared with traditional methods.

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.

Nexqt is a technology company that specializes in AI-powered carbon monitoring. It transforms untapped data streams and carbon cycle science into actionable insights, helping cities track and reduce their emissions in real-time. The platform provides detailed emissions data across different city scales, using advanced geolocation and satellite imagery to pinpoint carbon hotspots. This enables city stakeholders to make informed decisions, prioritize impactful investment opportunities, and implement effective climate action strategies.

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.

Paebbl is a carbon storage company that uses mineralization technology to convert carbon dioxide captured from industrial facilities or the atmosphere into carbon-negative materials for construction and other products, such as paper. The process aims to be energy efficient to enable scalable production of carbon-negative materials and lower net emissions. Paebbl was founded in 2021 by Pol Knops, Jane Walerud, Marta Sjögren, and Andreas Saari.

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.

Founded in 2017, Fervo Energy specializes in developing and operating geothermal assets using proprietary technology. Based in San Francisco, the company generates clean power through innovative geoscience methods, aiming to provide a dispatchable foundation for a 100% clean energy future.

Zanskar is a geothermal exploration and technology company focused on accelerating the discovery and development of geothermal energy resources. The company utilizes a predictive platform informed by extensive data, which includes subsurface characterization technology and advanced sensing techniques. By integrating artificial intelligence and big data, Zanskar enhances the exploration process and helps clients identify previously unknown geothermal resources, ultimately reducing the risks associated with such endeavors. Through its innovative approach, Zanskar aims to contribute to the advancement of geothermal energy as a sustainable resource.

Electrified Thermal Solutions, founded in 2021 and based in Medford, Massachusetts, develops innovative energy storage technology. The company converts intermittent renewable electricity into constant heat using low-cost conductive ceramic blocks, enabling industrial sectors to replace fossil fuels with zero-carbon heat.

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 optimizes aquaculture techniques to produce healthy, low-carbon protein while analyzing ocean data for carbon removal solutions.

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.

NovoNutrients is a pioneering biotechnology company specializing in the conversion of waste CO2 emissions into high-value proteins and additives for use in food and animal feed. The company's proprietary technology employs advanced gas fermentation systems and custom microbes to transform industrial waste CO2, hydrogen, and oxygen into safe, natural single-cell protein ingredients. This innovative process not only addresses global food security by providing a sustainable alternative protein source but also contributes to climate change mitigation through carbon capture and utilization.

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.

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.

Zap Energy, Inc. is a Seattle-based company that specializes in the design and manufacture of sheared-flow stabilized Z-Pinch fusion reactors for power generation. Founded in 2017, the company focuses on developing compact and scalable fusion technology that offers low-carbon, cost-effective, and flexible energy solutions. Unlike conventional fusion methods, Zap Energy's approach utilizes electric current to create magnetic fields that confine and compress plasma, enhancing the stability and efficiency of the fusion process. This innovative technology aims to provide sustainable energy while requiring less capital investment compared to traditional fusion systems.

Shyp is a manufacturing company that designs and builds electrolyzer that helps to produce hydrogen and oxygen using seawater.

Solidia Technologies is an advanced materials company that develops low‑energy processes for building and construction products. Its proprietary technology captures and stores CO₂ in concrete, turning the gas into a useful component of the material. The company’s solutions enable the production of cement, concrete, and stone alternatives that deliver higher performance while reducing energy use and waste. By integrating artificial intelligence into the manufacturing workflow, Solidia improves quality control, cuts material waste, and lowers carbon emissions, supporting a more sustainable construction industry. Founded in 2008 and headquartered in Piscataway, New Jersey, the firm serves the concrete and cement sectors worldwide.