Clouds for Climate
Reflect the heat. Preserve the cold.
C4C – cooling locally to save the climate globally
When the heat rises...
Climate change is becoming an increasingly urgent global issue, with its impacts on marine environments growing more visible every year. Rising greenhouse gas emissions are driving global temperatures upward, leading to profound changes in oceans and coastal ecosystems around the world.
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... fragile ecosystems pay the price.
One of the most striking examples is the Great Barrier Reef. Increasing ocean temperatures cause mass coral bleaching events, during which corals expel the symbiotic algae that provide them with energy and color. Repeated bleaching weakens the reef ecosystem, reduces biodiversity, and threatens one of the world’s most valuable marine habitats. [1]
The effects of climate change can also be observed in the Arctic. In 2024 alone, the glaciers of Svalbard lost approximately 61.7 gigatons of ice.[2] They are melting faster than ever before, and once critical tipping points are reached, the process may become irreversible—even if global temperatures were to decrease again.[3] As glaciers melt, large volumes of freshwater enter the oceans, contributing to sea-level rise. Svalbard alone was responsible for an estimated 0.16 mm increase in global sea levels in 2024.[2]
This freshwater input may also disrupt the Atlantic Meridional Overturning Circulation (AMOC), one of the most important ocean current systems on Earth. A significant slowdown of the Gulf Stream could trigger severe climatic consequences across the globe.[4]
These examples represent only a fraction of the challenges that climate change poses to marine ecosystems. Protecting vulnerable ocean regions is therefore not only a matter of preserving natural beauty and biodiversity. It is also essential for maintaining ecosystem services, safeguarding coastal populations, and mitigating some of the most severe consequences of a warming planet.
© 4m2s Consulting GmbH, Zürich – Video by Almut Eger
Marine Cloud Brightening...
Marine Cloud Brightening (MCB) is a technique inspired by nature itself. Clouds act like giant mirrors in the atmosphere, reflecting some of the sun’s energy back into space. Scientists noticed that ship exhaust leaves tiny particles, called aerosols, which allow water droplets to form—essentially brightening clouds over the ocean
This is the method applied in our project.
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... brighter clouds, cooler surface.
MCB builds on this natural process in a controlled way. Instead of relying on ship exhaust, researchers use specialized sprayers to release a fine mist of seawater into the air. As the droplets evaporate, they leave behind tiny salt crystals that serve as condensation nuclei. Around these crystals, clouds form with millions of smaller water droplets.
The difference is subtle, but powerful: clouds made of smaller droplets appear whiter and brighter. Brighter clouds reflect more sunlight back into space, which reduces the amount of solar energy absorbed by the ocean surface below. This creates a localized cooling effect that can help buffer vulnerable ecosystems from rising temperatures. [5]
Several universities and research teams around the world have already conducted projects exploring Marine Cloud Brightening. One of them being the Southern Cross University in Australia.
MCB Technology
The objective of the Marine Cloud Brightening (MCB) test system is to generate large quantities of sea-salt aerosol particles that can act as cloud condensation nuclei (CCN). These particles are produced by atomising seawater into extremely fine droplets which subsequently evaporate and form salt crystals small enough to be transported upward into the marine boundary layer.
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The process begins by drawing in seawater, which is first filtered to remove any particles that could block or damage the system. The clean water is then pumped at high pressure to an atomisation unit.
At this stage, compressed air from an industrial compressor is mixed with the pressurised seawater inside a specialised nozzle. This creates a mixture of air and water filled with tiny bubbles. When the mixture is released from the nozzle, the sudden drop in pressure causes these bubbles to rapidly expand and burst, breaking the water into an extremely fine mist of microscopic droplets—about 200 nanometres in size.
These tiny droplets are then carried upward by a powerful stream of air generated by a large fan. As they travel, the water quickly evaporates, leaving behind very small sea-salt particles.
Because these particles are so light (typically less than 0.2 micrometres in diameter), they can remain suspended in the air and be carried upward by natural air movements. Under the right weather conditions, they can help form clouds by acting as “seeds” that water vapour can condensate on.
In simple terms, the system combines three key steps—pressurising seawater, breaking it into a fine mist using air, and lifting the particles into the atmosphere—to safely and efficiently produce tiny sea-salt particles for Marine Cloud Brightening research.
Our Project
Clouds for Climate is a pilot initiative exploring the potential of Marine Cloud Brightening through controlled, real-world offshore testing.
The project focuses on the development and deployment of a small number of seawater-based aerosol generation systems on ships and/or offshore platforms. These systems are designed to operate in marine environments and release fine sea-salt aerosols into the lower atmosphere in a controlled manner.
The goal is to investigate whether such systems can reliably operate under real offshore conditions and whether their effects on marine cloud properties can be better understood through iterative, real-world testing.
Rather than assuming a fixed pathway or predefined deployment model, C4C is designed as an open development platform.
It combines engineering, offshore operations, and atmospheric research to build an empirical foundation for future decisions on scale, deployment strategy, and system design.
Project Objectives
Project Objectives: Making Marine Cloud Brightening real
The pilot project is structured around three key objectives that define the technical, operational, and scaling focus of Marine Cloud Brightening systems.
1. Offshore Deployment and Operation
A core objective is the reliable operation of MCB systems on ships and offshore platforms under real-world marine conditions.
Systems must be engineered to withstand strong winds, saltwater exposure, humidity, corrosion, and continuous motion while maintaining stable and energy-efficient performance. This includes system design, material selection, aerosol generation optimization, and safe onboard operation including monitoring and maintenance procedures.
2. Measurement, Verification, and Scaling
A key objective is to develop robust methods for observing and quantifying atmospheric effects under highly variable marine conditions.
Because systems operate in moving offshore environments, suitable approaches must account for natural variability in cloud systems. The project also aims to understand how effects scale with multiple systems and what deployment density would be required for meaningful and measurable atmospheric impact.
3. Regulatory and Deployment Framework
A further objective is to define practical deployment conditions for offshore operation.
While systems may operate in international waters, atmospheric processes are transboundary, and deployment must consider maritime regulations, shipping routes, and existing offshore infrastructure. These factors shape where and how systems can be realistically implemented and integrated.
Project Status
Project Status
Despite encouraging technical discussions and positive feedback on the concept, we have unfortunately not yet been able to secure the investment required to move the project into its next development phase.
As a result, the Clouds4Climate (C4C) project is currently paused (status summer 2026). We remain convinced of the scientific and technological potential of Marine Cloud Brightening as a possible climate intervention approach and hope to resume development when suitable funding and strategic partnerships become available.
We would like to thank everyone who has supported the project and expressed interest in our work. Should circumstances change in the future, we look forward to continuing the development of C4C.
Project Objectives
Project Objectives: Making Marine Cloud Brightening real
The pilot project is structured around three key objectives that define the technical, operational, and scaling focus of Marine Cloud Brightening systems.
1. Offshore Deployment and Operation
A core objective is the reliable operation of MCB systems on ships and offshore platforms under real-world marine conditions.
Systems must be engineered to withstand strong winds, saltwater exposure, humidity, corrosion, and continuous motion while maintaining stable and energy-efficient performance. This includes system design, material selection, aerosol generation optimization, and safe onboard operation including monitoring and maintenance procedures.
2. Measurement, Verification, and Scaling
A key objective is to develop robust methods for observing and quantifying atmospheric effects under highly variable marine conditions.
Because systems operate in moving offshore environments, suitable approaches must account for natural variability in cloud systems. The project also aims to understand how effects scale with multiple systems and what deployment density would be required for meaningful and measurable atmospheric impact.
3. Regulatory and Deployment Framework
A further objective is to define practical deployment conditions for offshore operation.
While systems may operate in international waters, atmospheric processes are transboundary, and deployment must consider maritime regulations, shipping routes, and existing offshore infrastructure. These factors shape where and how systems can be realistically implemented and integrated.
About Us
At 4Mangement2Security Group, we have been traveling to the Svalbard Archipelago for several years as part of our training, Leadership in extraordinary Situations. This unique program combines practical learning with the challenges and beauty of the Arctic environment.
Over time, it has brought us into close exchange with local experts and guides. This is how we met Christian Bruttel, an experienced local guide and founder of Spitzbergen Reisen. Our ongoing collaboration has developed into a strong and trusting relationship.
During our stays in Svalbard, we were consistently struck by the majestic landscape and the powerful presence of the glaciers. At the same time, witnessing their visible retreat year after year was deeply concerning. Experiencing these changes firsthand made the urgency of climate change tangible in a way that data and reports alone could not.
As a company, we began to ask ourselves: What can we do to make a meaningful difference?
This question led to the development of Clouds for Climate – a project dedicated to exploring innovative approaches to mitigating climate change, with a particular focus on maritime cooling.
With Clouds for Climate, we also aim to inspire and encourage others to take action and contribute positively to climate solutions.
