Our portfolio

Our climate tech ventures

32 innovative carbon emissions-mitigating startups have been launched so far by Carbon13’s Venture Builder for the Climate Emergency.

Each venture that you see on this page has the potential to reduce CO₂e emissions by at least 10 million tonnes per annum. 

On Tuesday 6th December, twelve Cohort 3 ventures will present their solutions at the prestigious Cambridge Union at the Showcase Day. The event is open to all our community, so you’re welcome to explore the event in more detail or click below to directly book your ticket for this popular event.

Cohort 1

xtonnes is next generation carbon management platform empowering enterprises of any size to reduce emissions and start their journey to Net Zero.
Offgrid.Finance works with clean and productive-use technology vendors to provide financing to their SME customers in emerging markets.

Agreed Earth’s mission is to accelerate the adoption of regenerative farming practices to reduce global carbon emissions and improve the profitability of the farms themselves.

Materials Nexus is revolutionising how new low-carbon materials are discovered and developed using their AI platform.

Electric vehicles promise a future of clean mobility, but their supply chains are complex, opaque and far from clean. Infyos is building a future where every electric vehicle battery is sustainable.

Tierra Foods is a food company for the 21st Century. 

They are optimising the potential of highly nutritious, but under-used plants from the Central American rainforest into innovative, carbon-negative ingredients for B2B. 

PuriFire Labs is a circular waste technologies company. Their patented technology converts plastic and other municipal waste into value-added products such as animal feed and electricity with minimal upfront sorting.
Windfinity aims to become a world leader in wind energy by acquiring legacy (20-year-old) wind turbines and then operating and maintaining them for another 10+ years.

Cohort 2

BioZeroc are a biomaterials science company using biotechnology to create carbon-negative construction materials. 

Bluemethane is a technology company developing a breakthrough data platform and hardware solution to sense and capture methane emissions from water.


Croptimise is a network of computer vision enabled smart traps to track pests and combining this with state-of-the-art machine learning models to build accurate and actionable pest forecasts.  

Emeralga Biotech

Emeralga Biotech employs novel biotechnology to process microalgae grown from  wastewater from the food and beverage industry to  generate by-products like proteins, vitamins and nutrients. 

Food Squared upcycles byproducts from food manufacturing into sustainable plant-based ingredients for the alternative protein industry, expanding the ingredient landscape beyond the current range of virgin wheat, pea, and soy.

Insenti is a software company that helps companies decarbonise their supply chains by identifying the most effective nature-based insetting projects for carbon and biodiversity. 

Kita’s purpose is to be a new type of insurance company. Our vision is to be the world’s first “carbon insurer”, covering the risk that carbon sequestration solutions under deliver against their promised carbon removal targets (“carbon delivery risk”).

Lime Track’s low-friction digital B2B food waste management platform ensures that food waste is cost-effectively collected, tracked and processed, and that Scope 1 and Scope 3 emissions are reduced and accurately reported.


NorthStar Platform solves the intention-action gap for sustainable projects by eliminating the search problems and decision paralysis in discovering and executing small to medium sized sustainable projects. 

Paradigm sits at the intersection of art and philanthropy to create valuable digital assets with everlasting environmental impact. We exist to support the organisations making a positive impact on the planet.

Phoenix Carbon is a disruptive, composite recycling process that goes beyond the state of the art. Phoenix Carbon is the enabler for a composite circular economy across Aero, Auto, Marine and Leisure sectors.

Shanti is enabling safer urban life through smart data, helping people walk, cycle and use public transportation by providing safer routes. 

Cohort 3


17Cicada is enabling the switch to petroleum-free plastics. By using bacteria to manufacture raw materials for polymers, they eliminate the economic and societal bond between plastic and crude oil.


Circular11 turns low-grade plastic waste into building materials and home products. In doing so, they create an end-market for the contaminated and film-based plastics that make up between 50 and 80% of global packaging waste.Circular11 turns lowgrade plastic waste into building materials and home products. Indoing so, theycreate an endmarket for the contaminated and filmbased plastics thatmake up between 50 and80% of global packaging waste.


Elaniti is developing an in-situ device to measure the soil microbiome – utilising physics, microbiology, biochemistry, and machine learning. They will enable a viable transition to regenerative agriculture.


Nium uses nanotechnology to decarbonise chemistry. They are starting with the #1 industrial chemical polluter: Ammonia. 

Mortar IO

Mortar IO is on a mission  to supercharge and de-risk retrofits. Mortar IO’s breakthrough technology helps organizations understand how to achieve net zero for entire portfolios in minutes, rather than months.

Open Hydro

Open Hydro’s platform builds on sector-specific knowledge and standardized reporting by the hydropower industry to assess carbon emissions and climate change impacts and plan actions.


Preoptima is the world’s first AI platform for real-time carbon planning for buildings and cities. They enable high-accuracy carbon calculations during  the ideation process, and thus, drive carbon reduction of hundreds of megatons.


reScope’s mission is to disrupt the climate intelligence space. They support investors’ strategic management of the transition and provide them with the necessary evidence to shift from brown to green investments.

Sun Bear Bioworks

Sun Bear Bioworks is on a mission to reimagine farming with precision fermentation to produce healthier and sustainable everyday ingredients for the food, cosmetics, medical and fuel industries.


Sunjul is the first impartial decision-making platform designed specifically for agrivoltaics, incorporating geospatial data on crop yield, water use, soil erosion and solar energy generation over the 30-year life of any project.

The Battery Recycling Company

The Battery Recycling Company(TBRC) is a deep tech startup, aiming to build the world’s first carbon-negative closed-loop battery recycling system by end 2023 -enabling the re-use of over 95% of materials currently used in EV Lithium-ion batteries.


Zori Tex’s mission is to eliminate textile waste to landfill and incineration. Their solution unlocks the value of circular textiles through technology innovations in sorted feedstock availability, enabling the new textile-to-textile recycling market to rapidly scale and supporting a reduction in greenhouse gas emissions.

Carbon13’s mission is to use entrepreneurship to reduce emissions by at least 400m tonnes per annum. It was founded with a belief that diversity in entrepreneurial founders is an important part of bringing the “think different” mindsets and perspectives to the fore which can achieve the kinds of breakthroughs required by the Net Zero challenge. It is notable therefore that 18 of the 32 ventures have female founders, and ten have minority ethnic leaders (including five CEOs.) In Cohort 3 alone, 75% of the ventures have teams of more than one nationality, with founders from America, Asia, Europe and Africa. 

Want to add to this list?

If you too want to become a founder of a high growth startup capable of reducing emissions by 10 million tonnes per year, then applications are open now for Cambridge Cohort 5 which will begin 14th March 2023, and for Europe Cohort 1 which will begin 21st February 2023. 

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We’ll share regular updates on our Venture Builder cohorts, company news, community events, and resources on Net Zero entrepreneurship.
We’ll also share opportunities for how to get involved with the ventures generated by the Venture Builder.
If you’d like to learn more about investing in our ventures, you can learn more about the Carbon13 SEIS fund here.