Since the Industrial revolution, humanity has extracted and burned enormous amounts of carbon in the form of oil, coal or natural gas. The greenhouse gases released in the process are dramatically changing the lives of people around the world. Weather extremes and their effects, such as droughts, floods or wildfires, are on the rise. They destroy livelihoods and threaten people's health, lives and well-being. The global community agrees: global warming must be limited to less than two degrees Celsius compared to the level before the beginning of industrial era. That is why countries like Germany have formulated goals and steps on how they want to reduce emissions of greenhouse gases in the coming years and decades. And indeed, there is progress. Emissions are falling - but so far far too slowly.

Climate experts agree: reducing CO₂ emissions in itself will not be enough. We must also remove enormous amounts of greenhouse gases from the atmosphere and thus reverse past emissions. Innovators from all over the world have already shown that this is technically possible. However, these methods are immensely expensive, often energy-intensive and frequently fail to scale.

That's why we invited innovators to join this future-relevant challenge at the beginning of 2022 - to develop a solution in the fight against climate change that removes CO₂ from the atmosphere in the long term, is scalable and can be implemented in an economic business model.

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The challenge: To remove large quantities of CO₂ from the atmosphere over the long term and bind them economically in products.

The way in which our Challenge teams achieve this goal, the technological basis on which CO₂ is extracted from the atmosphere, is up to them, be it via direct air capture, bioenergy with carbon capture, processing of organic materials or any other method. They demonstrate how they turn atmospheric CO₂ into raw materials or products that sequester carbon for decades; and how the process from CO₂ capture to the produced raw material or product is or may be economically viable. To contribute to the fight against climate change, it must also be able to be implemented at scale.

Without breakthrough innovations, we cannot sufficiently reduce the CO₂ content of the atmosphere. As a result, we are in danger of missing our climate goals. The SPRIND Challenge is our chance for a breakthrough.

Carlos Härtel, Chief Technology Officer, Climeworks

Carlos Härtel, Chief Technology Officer, Climeworks

Participating in the Challenge will push the teams to comprehensively stress-test their idea. We therefore provide intensive and individual support. This includes funding the teams as well as individual support from a Challenge coach, who has significant experience in the Challenge area and has already implemented high-impact innovations.

In the first year of the Challenge, SPRIND will fund the teams’ work with up to 600,000 euros. In the further course of the Challenge, this funding may be higher. We provide funding quickly and unbureaucratically, so that the teams can concentrate fully on their innovations. At the end of the first stage of the Challenge, the jury decides which teams will continue to participate in the Challenge based on interim evaluations. As finalists, these teams will have the opportunity to comprehensively demonstrate their breakthrough.

Thinking one step further: Ideas with the potential for a breakthrough must be brought to market for the benefit of people and planet. That is why SPRIND continues to support projects with breakthrough potential even after the Challenge has formally finished.

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After months of intense work, experimentation, and collaboration, the three teams were declared joint winners of the Carbon-to-Value Challenge by the expert jury in September 2024. Each team successfully demonstrated significant advancements in their unique carbon sequestration technology. While the approaches varied—from creating carbon-negative building materials and seaweed farms to transforming CO₂ into hydrocarbons—all three teams have shown pathways towards making climate solutions both technologically and financially viable.

Science Youtuber Jacob Beautemps introduces the five Challenge teams of the 1st stage at Breaking Lab

Breaking Lab Carbon-to-value

Our jury of scientists and science entrepreneurs has selected the teams that have what it takes to implement breakthrough innovations.

Mark Hartney

Mark Hartney

Anne Lamp

Anne Lamp

Carlos Härtel

Carlos Härtel

Henrik Pontzen

Henrik Pontzen

Richard Templer

Richard Templer

SPRIND supports all teams in achieving the Challenge goal. This includes that SPRIND finances the work of the teams from the beginning of the Challenge. In addition, we provide all teams with a coach who has extensive experience in implementing high impact innovations. From this experience, the coach supports the teams, for example, in planning work packages and experiments, or in networking with collaboration partners or subcontractors. In addition, SPRIND uses its network to promote the implementation of breakthrough innovations.

SPRIND finances the work of the teams within a predefined framework.

The funding is provided as an individual fixed price based on a pre-commercial procurement. In stage 1, SPRIND finances up to 600,000 euros per team. The teams state their bid price for stage 1 in their application for the Challenge. Teams will state their Stage 2 bid price in their Stage 2 applications. The maximum amount of funding for this subsequent stage may be higher than the funding in stage 1. Payments will follow the payment schedules defined in the participation agreement. There is no accounting of actual costs at the end of each stage. The imputed risk is borne by the team.

All expenses that serve to achieve the Challenge goal can be financed with SPRIND funds. This can include, for example, personnel costs, equipment and materials or rent.

The intellectual property rights created by the teams during the Challenge remain with the teams. SPRIND receives a free and non-exclusive right to use the results found. The teams undertake to grant licences to third parties at standard market conditions. Details can be found in the Participation agreement.

SPRIND is committed to supporting innovators in implementing breakthrough innovations. If SPRIND identifies breakthrough innovation potential in the teams during the Challenge, their work can continue to be supported after the Challenge has ended.

No, it is no longer possible to apply for this Challenge. If you are working on Carbon Dioxide Removal solutions with potential for disruptive innovation, please feel free to contact us or submit a project proposal via the submission form of our open-topic program.

A team of SPRIND experts makes a preliminary selection from the applications received. The final decision is made by the jury.

The Challenge has a total duration of 2.5 years. At the end of the one-year stage 1 of the Challenge, a further selection round takes place to determine which of the Challenge teams will also be funded by SPRIND in stage 2.

All challenge teams are in close contact with SPRIND and the coaching team during the course of the challenge. This ensures a targeted innovation process in which emerging hurdles can be identified and addressed at an early stage. Furthermore, no detailed statements on the use of funding are required.

Do you have any questions about the Challenge? Write to us at challenge@sprind.org.

Jano Costard
Jano Costard, Challenge Officer

IN THE MIDDLE OF THE SEA

How MacroCarbon turns algae into bio­plastics and fuel

the ocean and an algae farm
Our first aquafarm is in Gran Canaria, in the port of Las Palmas. We grow algae on 2,000 square metres, mainly sargassum, but also other local algae that occur naturally here, says Fernández-Méndez proudly. The advantage of sargassum: The brown algae not only binds a lot of CO₂, it also spreads quickly and, above all, drifts freely in the sea.

The seaweed plant can be imagined as a large carpet of algae growing on the surface of the water, surrounded by a large barrier in the form of a floating ring. An important part of our engineering work is to look at different wave conditions to ensure that the algae do not spread outside the barrier. In addition, the algae are regularly analysed underwater and above water by using drones.
Green algae are collected from a pool of water
Our world is changing. Marine microbiologist Dr Mar Fernández-Méndez has seen the effects of the climate crisis with her own eyes. After my PhD, I went to the Arctic every year as a scientist for the Alfred Wegener Institute, she explains. On one expedition, Google Maps showed us that we were already on a glacier, but the glacier was actually three kilometres away. A wake-up call for Fernández-Méndez. I can no longer do normal research and just watch the Arctic melt. I have to do something.

Together with co-founder Jason Cole, she set up a company called MacroCarbon. Together they want to tackle the global CO₂ problem using algae. Algae store CO₂ as they grow - much more efficiently than trees. MacroCarbon's mission is to cultivate as much algae as possible and to use the CO₂ stored by the algae economically for CO₂-negative products.
A team member collects the harvested brown algae from a bucket

If you harvest about five per cent of the biomass every week, the biomass will grow back to 100 per cent within a week - Mar Fernández-Méndez

The algae are slowly harvested from the sea using a ship that lowers a conveyor belt into the water. Fish and other marine life are not caught: They can jump back into the water from the very slow conveyor belt.

Depending on the process, the wet algae can be dried or processed wet. The subsequent processing is decisive: We use high-temperature vacuum pyrolysis. This means that the algae is heated to a high temperature, but without oxygen, so there's no combustion, explains Fernández-Méndez. This produces two products: Biochar and a gas. The gas is used directly in a Fischer-Tropsch synthesis. Possible end products are bio-naphtha, sustainable aviation fuel and biodiesel for marine use.
A bottle labeled BioNaphtha with brown algae lying next to it
The next 40,000 square metre aquafarm is already being planned. And the goal is clear: MacroCarbon wants to take its algae farms far out to sea. There, the aquafarms could be even bigger. The biggest problem: the licences.

In international waters, there are many regulations that affect ships. But our barriers are not ships, says Fernández-Méndez. So we have to see how to categorise our barriers. But Fernández-Méndez is sure she will find a solution. I am a stubborn optimist. Even if there are sometimes frustrating moments, I always get up again. Fernández-Méndez's passion not only drives her, but the whole team. You can't do it alone. MacroCarbon's success story is not the story of one person, but of a group of people who want to make a difference.
There are various containers with liquids and algae on a shelf in the laboratory
Naphtha is an important raw material for the chemical industry that can be processed into durable plastic products. When we talk about bioplastics, many people immediately think of biodegradable plastics. This is not the case with our products. We convert algae into naphtha, so it's bio-naphtha, but our product has exactly the same properties as normal naphtha and is not biodegradable, Fernández-Méndez explains. This means that the CO₂ can be stored in the long term.

However, when the aviation fuel or biodiesel is used for shipping, the CO₂ stored in the algae is released. So these products are only CO₂ neutral and not CO₂ negative? Because we always produce biochar, the products that are reburned are also CO₂ negative to a certain extent, says Fernández-Méndez. So we always absorb more CO₂ than we release. The biochar can also be used commercially, for example as a substitute in cement production.
The marine microbiologist's algae are not only helping to solve the climate crisis, they are also improving another problem: The algae's CO₂ uptake is already having a direct effect in the sea: Ocean acidification is less around our farms, we have more oxygen in the water and the algae also increase biodiversity, explains Fernández-Méndez. Fish, crabs and many other animals live among the algae.
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