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Call key data

The ocean-climate-biodiversity nexus and marine carbon dioxide removal (mCDR)

Funding Program

Horizon Europe: Cluster 6 - Food, Bioeconomy, Natural Resources, Agriculture and Environment

Call number

HORIZON-CL6-2025-02-CLIMATE-01

deadlines

Opening
06.05.2025

Deadline
16.09.2025 17:00

Funding rate

100%

Call budget

€ 12,000,000.00

Estimated EU contribution per project

€ 6,000,000.00

Link to the call

Link to the submission

Call content

short description

In line with the European and global biodiversity and climate objectives, successful proposals should further the European efforts in achieving both climate–neutrality and ocean sustainability by improving the scientific understanding of ocean climate interventions and their short, medium and long term effects, impacts and risks, and developing monitoring and response measures guided by the precautionary principle and supporting decision-making at regional, European and global levels.
 

Call objectives

Environmentally safe, socially acceptable, and economically viable carbon dioxide removal (CDR) is needed to support the realisation of European and worldwide climate policies. There is considerable uncertainty regarding scalability and the short, medium and long-term effectiveness and impacts on marine ecosystems and human health. Mindful of the precautionary approach, legitimate, responsible, multi and trans-disciplinary, transparent, and inclusive scientific research to evaluate mCDR techniques is urgently needed.

The London Protocol also calls for certain activities other than legitimate scientific research to be deferred (LC 45/LP 18). The Convention on Biological Diversity (CBD) recognizes the importance of biodiversity in the context of climate-related geoengineering. Decision X/33 of the CBD emphasizes the need for a cautious approach, specifying that no climate-related geoengineering activities that may affect biodiversity should take place until there is an adequate scientific basis to justify such activities and that small-scale scientific research studies are allowed if conducted in controlled settings and justified by the need for specific scientific data. The CBD also requests the compilation of scientific information on the impacts of geoengineering on biodiversity and the study of gaps in existing mechanisms.

Whether the ocean has a potential to help achieve the required extent of additional carbon dioxide removal (beyond the ocean sink driven by increasing atmospheric CO2 concentrations), while maintaining its integrity and health, requires further research.

Among the greatest challenges associated with mCDR technologies is the ability to measure, monitor and verify the amount of additional carbon removed over time, and to assess the environmental effects of the mCDR technology. This is particularly challenging in the ocean environment, an open system with high inertia, globally connected food-webs and high difference in life traits of species in marine life assemblages, for which safety margins need to be considered, and when considering scale up of these technologies would likely require significant additions in hydrodynamically optimum sites, potentially leading to overlaps with repeated, cumulative and/or transboundary exposures and impacts.

Principled ocean CDR research must be precautionary, inclusive, and well-planned, conducted with a view to ensure these technologies are effective, without harming the environment and people. The research conducted under the topic is to be grounded in the Guide to Best Practices in Ocean Alkalinity Enhancement Research.

The topic is guided by a focus on integrated climate stabilization and biosphere stewardship for the resilience of the entire Earth system. From this perspective, a comprehensive approach to climate and biosphere stewardship is needed, as well as considering all the sustainability dimensions to guide future decisions.

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Expected effects and impacts

Actions should aim at developing innovative approaches to address only one of the following options:

Option A: Ocean Alkalinity Enhancement (OAE): biogeochemical and physiological responses and impacts on marine ecosystems

The project is expected to:

  • elucidate many unknowns that remain about the efficacy, effectiveness, feasibility, covering both technological readiness and lead time until full potential effectiveness, effectiveness to increase net carbon uptake, effectiveness to reduce ocean warming, ocean acidification, scalability, duration of effects, termination effects, Energy Return on Energy Invested (EROEI), environmental and ecological risk (intended, unintended, undesirable consequences at scale), co-benefits, disbenefits, risks, cost effectiveness, externalities, trade-offs, and competing interests, weighing the impact on reducing climate change by OAE against its negative environmental effects, etc. The actions should use a Life Cycle Assessment (LCA) methodology and consider all the sustainability dimensions (in particular SDGs 3, 6, 9, 12, 13, 14, 15, 16 and 17), across different temporal and spatial scales;
  • cover the desirability, ethical considerations, social and political considerations and governability from an international perspective, conducting comprehensive and responsible research to inform decision making under climate inertia about OAE and its potential application;
  • carry out comprehensive assessment of the Ocean Alkalinity Enhancement (OAE) and its short, medium and long term impacts on ocean biogeochemistry (including acidification), on pelagic, coastal and deep ocean ecosystems, their assemblages and trophic webs, on marine organisms that are not able to concentrate carbon within their cells under conditions of increased alkalinity, potentially strong fluctuations in pH and seawater pCO2 impacting plankton and microbiome populations dynamics, species competition and assemblages of connected trophic webs, and calcium hydroxide precipitation threatening coral reefs, plants, periphyton and cyanobacteria due to sensitivity to high levels of turbidity, on primary and second production, on seasonal changes in biogeochemistry and plankton dynamics;
  • conduct an assessment and evaluation of the rate and severity of the local impacts and compare multiple datasets to deliver a greater holistic understanding of OAE’s biological and ecological impacts regionally and globally, on human wellbeing linked to the degree to which the overall changes in primary and secondary production may result in change of species assemblage on which coastal livelihoods depend; the increased accumulation of contaminants within food chains via the release of minerals such as cadmium, nickel, chromium, iron and silicon, with potential implications for human health; the environmental impacts associated with extensive calcium carbonate mining operations, mineral distribution, the energy-intensive oxy-calcination process, dispersion operations, impact on resource scarcity due to high electric consumption, assessment and evaluation of additional resources needed;
  • numerical modelling should be used to assess the scale of the consequences under various scenarios, experimental work in-situ like in mesocosms and benthocosms and ex-situ like in large flow through experimental chambers can help to improve parametrization of geo-biochemical processes. Field experiments are out of scope. The action should improve the precision of predictions and inform ESMs, IAMs and the Carbon Dioxide Removal Model Intercomparison Project (CDRMIP);
  • advance the knowledge related to cost and challenges of carbon accounting, cost of environmental monitoring and the need to track impacts beyond carbon cycle on marine ecosystems.

Option B: Monitoring the global ocean for safe, verifiable and sustainable potential marine carbon dioxide removal (mCDR)

The project is expected to:

  • establish building blocks and capabilities towards realistic, long-term, sustainable, rigorous, standardized monitoring of potential marine carbon dioxide removal and sequestration, including operational system requirements, and cover aspects of detection, attribution and determination;
  • advance empirical approaches and new data needed for data-based ocean modelling (vs. numerical simulations) and develop ocean simulation capabilities based on integrated physical, biogeochemical and ecological oceanic components;
  • develop the monitoring capability for quantifying the effectiveness and durability of carbon sequestration, especially in the offshore mesopelagic water column, and identify environmental and ecological short-, medium- and long-term impacts (days to 100s of years) on the ocean and marine ecosystems functioning and the ecosystem services they naturally provide (e.g., biological carbon pump), accounting for climate inertia;
  • enable monitoring the multiple components of the carbonate system and, especially in coastal zones, at appropriate spatial and temporal resolution, and considering existing monitoring schemes and databases, such as the Copernicus Marine Environment Monitoring Service (CMEMS), Global Ocean Data Analysis Project (GLODAP) or the Surface Ocean CO2 Atlas (SOCAT);
  • utilise enhanced data from observing/modelling to advance scientific knowledge of the ocean-climate-biodiversity nexus and potential impacts of deliberate perturbations (i.e. mCDR). in the ocean, particularly the deep-sea and coastal environments (speed and magnitude of change, thresholds and tipping points), marine ecosystems functioning and the ecosystem services they provide, including carbon and nutrients cycling, climate regulation and fisheries, for future ocean sustainability and decision-making about active climate remediation, trade-offs and policy needs for decision-making under climate inertia.

For both options A&B, the actions funded under this topic should have a strong collaboration mechanism. Proposals should include a dedicated task, appropriate resources, and a plan on how they will collaborate and ensure synergies with relevant activities carried out under other initiatives.

The actions should build on existing observing platforms, e.g. in the context of the Copernicus programme, and strengthen and expand the current capacities in an inter and multidisciplinary and ecosystem-based approach.

The research carried out should also include SSH perspectives and gender, and the research on desirability, benefits and disbenefits should also be done in relation to desirability for whom, benefits and disbenefits for whom, adding a comprehensive justice perspective on the call, including intergenerational aspects. International cooperation is essential.

A strong linkage should be ensured with the activities under the UN Decade of Ocean Science and ongoing Horizon projects, the Copernicus marine service (CMEMS), GOOS, the Ocean Biogeographic Information System (OBIS), MBON of GEOBON, ICOS, GCOS, and other relevant international Ocean Observing Initiatives. All in-situ data collected should follow INSPIRE principles and be available through open access repositories supported by the European Commission (Copernicus, and EMODnet). Synergies with the Horizon Europe Mission Restore our Ocean and waters is encouraged. The projects outputs may contribute to the European Digital Twin of the Ocean and the Destination Earth initiative and outline specific plans to this effect.

This topic is part of a coordination initiative between ESA and the European Commission on Earth System Science and should towards this end include sufficient means and resources for effective coordination. Projects should leverage the data and services available through European Research Infrastructures federated under the European Open Science Cloud, Copernicus, as well as data from relevant data spaces in the data-driven analyses. Projects could additionally benefit from access to infrastructure and relevant FAIR data by collaborating with projects funded under the topics HORIZON-INFRA-2022-EOSC-01-03: FAIR and open data sharing in support of healthy oceans, seas, coastal and inland waters and HORIZON-INFRA-2024- EOSC-01-01: FAIR and open data sharing in support of the mission adaptation to climate change. Collaboration with the relevant existing European Research Infrastructures such as those prioritised by the European Strategy Forum on Research Infrastructures (ESFRI) is encouraged.

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Expected results

Project results are expected to contribute to several of the following expected outcomes:

  • advanced knowledge on scientific aspects, environmental, legal, socio-political and governance considerations for Ocean Alkalinity Enhancement (OAE);
  • advanced modelling, monitoring and simulation capabilities (including AI methods and tools) needed for the monitoring, reporting and verification of marine carbon dioxide removal (mCDR) and further improved Earth System Models (ESMs), including the Carbon Dioxide Removal Model Intercomparison Project (CDRMIP);
  • enabled evidence-based European and global decision–making on mCDR, sustained European leadership in ocean–climate–biodiversity science nexus, and significant contribution to global scientific assessments.

Eligibility Criteria

Regions / countries for funding

EU Member States, Overseas Countries and Territories (OCT)
Moldova (Moldova), Albania (Shqipëria), Armenia (Հայաստան), Bosnia and Herzegovina (Bosna i Hercegovina / Босна и Херцеговина), Canada, Faeroes (Føroyar / Færøerne), Georgia (საქართველო), Iceland (Ísland), Israel (ישראל / إِسْرَائِيل), Kosovo (Kosova/Kosovë / Косово), Montenegro (Црна Гора), New Zealand (Aotearoa), North Macedonia (Северна Македонија), Norway (Norge), Serbia (Srbija/Сpбија), Tunisia (تونس /Tūnis), Türkiye, Ukraine (Україна), United Kingdom

eligible entities

EU Body, Education and training institution, Non-Profit Organisation (NPO) / Non-Governmental Organisation (NGO), Other, Private institution, incl. private company (private for profit), Public Body (national, regional and local; incl. EGTCs), Research Institution incl. University, Small and medium-sized enterprise (SME)

Mandatory partnership

Yes

Project Partnership

To be eligible for funding, applicants must be established in one of the following countries:

  • the Member States of the European Union, including their outermost regions
  • the Overseas Countries and Territories (OCTs) linked to the Member States
  • countries associated to Horizon Europe - see list of particpating countries

Only legal entities forming a consortium are eligible to participate in actions provided that the consortium includes, as beneficiaries, three legal entities independent from each other and each established in a different country as follows:

  • at least one independent legal entity established in a Member State; and
  • at least two other independent legal entities, each established in different Member States or Associated Countries.

Any legal entity, regardless of its place of establishment, including legal entities from non-associated third countries or international organisations (including international European research organisations) is eligible to participate (whether it is eligible for funding or not), provided that the conditions laid down in the Horizon Europe Regulation have been met, along with any other conditions laid down in the specific call topic.

A ‘legal entity’ means any natural or legal person created and recognised as such under national law, EU law or international law, which has legal personality and which may, acting in its own name, exercise rights and be subject to obligations, or an entity without legal personality.

other eligibility criteria

Specific cases:

  • Affiliated entities (i.e. entities with a legal or capital link to a beneficiary which participate in the action with similar rights and obligations to the beneficiaries, but which do not sign the grant agreement and therefore do not become beneficiaries themselves) are allowed, if they are eligible for participation and funding.
  • Associated partners (i.e. entities which participate in the action without signing the grant agreement, and without the right to charge costs or claim contributions) are allowed, subject to any conditions regarding associated partners set out in the specific call conditions.
  • Entities which do not have legal personality under their national law may exceptionally participate, provided that their representatives have the capacity to undertake legal obligations on their behalf, and offer guarantees to protect the EU’s financial interests equivalent to those offered by legal persons.
  • Legal entities created under EU law (EU bodies) including decentralised agencies may be part of the consortium, unless provided for otherwise in their basic act.
  • International European research organisations are eligible to receive funding. International organisations with headquarters in a Member State or Associated Country are eligible to receive funding for ‘Training and mobility’ actions or when provided for in the specific call/topic conditions. Other international organisations are not eligible to receive funding, unless provided for in the specific call/topic conditions, or if their participation is considered essential for implementing the action by the granting authority.
  • Joint Research Centre (JRC)— Where provided for in the specific call conditions, applicants may include in their proposals the possible contribution of the JRC but the JRC will not participate in the preparation and submission of the proposal. Applicants will indicate the contribution that the JRC could bring to the project based on the scope of the topic text. After the evaluation process, the JRC and the consortium selected for funding may come to an agreement on the specific terms of the participation of the JRC. If an agreement is found, the JRC may accede to the grant agreement as beneficiary requesting zero funding or participate as an associated partner, and would accede to the consortium as a member.
  • Associations and interest groupings — Entities composed of members (e.g. European research infrastructure consortia (ERICs)) may participate as ‘sole beneficiaries’ or ‘beneficiaries without legal personality’. However, if the action is in practice implemented by the individual members, those members should also participate (either as beneficiaries or as affiliated entities, otherwise their costs will NOT be eligible.
  • EU restrictive measures — Entities subject to EU restrictive measures under Article 29 of the Treaty on the European Union (TEU) and Article 215 of the Treaty on the Functioning of the EU (TFEU) as well as Article 75 TFEU, are not eligible to participate in any capacity, including as beneficiaries, affiliated entities, associated partners, third parties giving in-kind contributions, subcontractors or recipients of financial support to third parties (if any).
  • Legal entities established in Russia, Belarus, or in non-government controlled territories of Ukraine — Given the illegal invasion of Ukraine by Russia and the involvement of Belarus, there is currently no appropriate context allowing the implementation of the actions foreseen in this programme with legal entities established in Russia, Belarus, or in non-government controlled territories of Ukraine. Therefore, even where such entities are not subject to EU restrictive measures, such legal entities are not eligible to participate in any capacity. This includes participation as beneficiaries, affiliated entities, associated partners, third parties giving in-kind contributions, subcontractors or recipients of financial support to third parties (if any). Exceptions may be granted on a case-by-case basis for justified reasons.
    With specific regard to measures addressed to Russia, following the adoption of the Council Regulation (EU) 2024/1745 of 24 June 2024 (amending Council Regulation (EU) No 833/2014 of 31 July 2014) concerning restrictive measures in view of Russia’s actions destabilising the situation in Ukraine, legal entities established outside Russia but whose proprietary rights are directly or indirectly owned for more than 50% by a legal person, entity or body established in Russia are also not eligible to participate in any capacity.
  • Measures for the protection of the Union budget against breaches of the principles of the rule of law in Hungary — Following the Council Implementing Decision (EU) 2022/2506, as of 16 December 2022, no legal commitments can be entered into with Hungarian public interest trusts established under the Hungarian Act IX of 2021 or any entity they maintain. Affected entities may continue to apply to calls for proposals and can participate without receiving EU funding, as associated partners, if allowed by the call conditions. However, as long as the Council measures are not lifted, such entities are not eligible to participate in any funded role (beneficiaries, affiliated entities, subcontractors, recipients of financial support to third parties, etc.).In case of multi-beneficiary grant calls, applicants will be invited to remove or replace that entity in any funded role and/or to change its status into associated partner. Tasks and budget may be redistributed accordingly.

Additional information

Topics

Air Quality, Biodiversity & Environment, Climate & Climate Change, Water quality & management, 
Digitalisation, Digital Society, ICT

Relevance for EU Macro-Region

EUSAIR - EU Strategy for the Adriatic and Ionian Region, EUSALP - EU Strategy for the Alpine Space, EUSBSR - EU Strategy for the Baltic Sea Region, EUSDR - EU Strategy for the Danube Region

UN Sustainable Development Goals (UN-SDGs)

Additional Information

Applications must be submitted electronically via the Funders & Tenders Portal electronic submission system (accessible via the topic page in the Search Funding & Tenders section). Paper submissions are NOT possible.

Applications must be submitted using the forms provided inside the electronic submission system (not the templates available on the topic page, which are only for information). The structure and presentation must correspond to the instructions given in the forms.

Applications must be complete and contain all parts and mandatory annexes and supporting documents.

The application form will have two parts:

  • Part A (to be filled in directly online) contains administrative information about the applicant organisations (future coordinator and beneficiaries and affiliated entities), the summarised budget for the proposal and call-specific questions;
  • Part B (to be downloaded from the Portal submission system, completed and then assembled and re-uploaded as a PDF in the system) contains the technical description of the project.

Annexes and supporting documents will be directly available in the submission system and must be uploaded as PDF files (or other formats allowed by the system).


The limit for a full application (Part B) is 50 pages.


Eligible costs will take the form of a lump sum as defined in the Decision of 7 July 2021 authorising the use of lump sum contributions under the Horizon Europe Programme – the Framework Programme for Research and Innovation (2021-2027) – and in actions under the Research and Training Programme of the European Atomic Energy Community (2021-2025). It is mandatory to submit a detailed budget table using the template available in the Submission system.


To ensure a balanced portfolio covering the topic, grants will be awarded to applications not only in order of ranking but at least also to those that are the highest ranked within each of the two options (A, B), provided that the proposals attain all thresholds.

Contact

National Contact Points for Horizon Europe
Website

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