Solar Radiation Modification
Understanding SRM
Solar Radiation Modification includes a number of technologies intended for both land, oceans and sky/space.
Stratospheric Aerosol Injection
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Marine Cloud Brightening
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Solidarity, equity and justice
within countries and globally
Marine Cloud Brightening (MCB) is a theoretical solar geoengineering technique that aims to create whiter clouds in order to reflect more sunlight back to space. The brightening of the clouds is to be attained by enhancing the concentration of smaller cloud droplets. To achieve this, MCB proponents suggest shooting large amounts of tiny particles, such as sea salt aerosols, into marine clouds. These particles would act as cloud condensation nuclei: molecules of water vapour would gather around these condensation nuclei to form tiny cloud droplets. And how should the particles reach the clouds? The proposals suggest injecting salty aerosols into marine cloud layers by sprayings seawater from vessels with nozzles able to turn saltwater into tiny particles.
Reasons to reject and ban SRM
Related HOME Alliance publications
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HOME Alliance Achievements on SRM
Current HOME Alliance campaigns on SRM
SRM resources on Geoengineering Monitor
Current HOME Alliance campaigns on SRM
Impossible governance requirements – and risks of wars
Solar geoengineering would require functional global governance systems for thousands of years – an impossible requirement. It would also create risks for international conflict and wars. Who would control the thermostat? What will happen when superpowers disagree?
Providing the fossil fuel industry and polluters false excuses
As people are starting to realise that society can and must decarbonize to real zero as quickly as possible, and that we already have the technology to do so, solar geoengineers provide fossil fuel producers and emitters with yet another excuse to delay and evade.
Exacerbating inequalities and climate injustice
Solar geoengineering research is advanced by a limited clique of predominantly white, male researchers at elite universities, and wealthy philantropists based in the Global North, while impacts would be felt first and hardest by indigenous peoples and communities in the Global South.
A slippery slope down the abyss
Advancement of solar geoengineering technology must be halted now, before the idea becomes normalised, and before scientific careers, research funds, and vested and commercial interests become more consolidated, forcing the world down a slippery slope towards eventual deployment.
Droughts, floods, changing monsoon and threats to food and water for billions of people
Dimming the sun by injecting particles into the sky will not dial back climate change – it will introduce massive new disruptions and further disturb already disrupted climate systems, with likely disastrous impacts on regional climates, ecosystems and peoples’ livelihoods.
The threat of devastating termination shock
If injections are stopped abruptly, decades or centuries worth of pent-up global heating would result in spiking temperatures almost immediately. Such a termination shock would rip earth’s societies and ecosystems apart. If we start relying on solar geoengineering we would likely have to continue for thousands of years, even as catastrophes mount.
Impossible governance requirements – and risks of wars
Solar geoengineering would require functional global governance systems for thousands of years – an impossible requirement. It would also create risks for international conflict and wars. Who would control the thermostat? What will happen when superpowers disagree?
Providing the fossil fuel industry and polluters false excuses
As people are starting to realise that society can and must decarbonize to real zero as quickly as possible, and that we already have the technology to do so, solar geoengineers provide fossil fuel producers and emitters with yet another excuse to delay and evade.
Exacerbating inequalities and climate injustice
Solar geoengineering research is advanced by a limited clique of predominantly white, male researchers at elite universities, and wealthy philantropists based in the Global North, while impacts would be felt first and hardest by indigenous peoples and communities in the Global South.
A slippery slope down the abyss
Advancement of solar geoengineering technology must be halted now, before the idea becomes normalised, and before scientific careers, research funds, and vested and commercial interests become more consolidated, forcing the world down a slippery slope towards eventual deployment.
Droughts, floods, changing monsoon and threats to food and water for billions of people
Dimming the sun by injecting particles into the sky will not dial back climate change – it will introduce massive new disruptions and further disturb already disrupted climate systems, with likely disastrous impacts on regional climates, ecosystems and peoples’ livelihoods.
The threat of devastating termination shock
If injections are stopped abruptly, decades or centuries worth of pent-up global heating would result in spiking temperatures almost immediately. Such a termination shock would rip earth’s societies and ecosystems apart. If we start relying on solar geoengineering we would likely have to continue for thousands of years, even as catastrophes mount.
Impossible governance requirements – and risks of wars
Solar geoengineering would require functional global governance systems for thousands of years – an impossible requirement. It would also create risks for international conflict and wars. Who would control the thermostat? What will happen when superpowers disagree?
Providing the fossil fuel industry and polluters false excuses
As people are starting to realise that society can and must decarbonize to real zero as quickly as possible, and that we already have the technology to do so, solar geoengineers provide fossil fuel producers and emitters with yet another excuse to delay and evade.
Exacerbating inequalities and climate injustice
Solar geoengineering research is advanced by a limited clique of predominantly white, male researchers at elite universities, and wealthy philantropists based in the Global North, while impacts would be felt first and hardest by indigenous peoples and communities in the Global South.
A slippery slope down the abyss
Advancement of solar geoengineering technology must be halted now, before the idea becomes normalised, and before scientific careers, research funds, and vested and commercial interests become more consolidated, forcing the world down a slippery slope towards eventual deployment.
What does HOME Alliance do?
Movement building
We mobilise movements across continents. We build power to champion real solutions and counter geoengineering.
Advocacy
We engage in policy spaces to advocate precaution, non-use and effective international agreements, from local level to United Nations fora.
Campaigns
We create and drive campaigns against geoengineering projects and for sound policies and regulations.
Narratives
We shape the public discourse by engaging in media and popular education to counter efforts to normalise geoengineering.
Latest news
Africa champions victory at UNEA6
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HOME Alliance recruits new staff
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SCoPEx project terminated
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Learn more at the Geoengineering Monitor website!
Track geoengineering projects with the Geoengineering Map!
What is geoengineering?
Geoengineering includes many different technologies. They are all risky, speculative and poised to be controlled by superpowers and wealthy corporations. None address the root causes of climate change.
Solar radiation manipulation (SRM)
Carbon dioxide removal (CDR)
Weather modification
Learn more at the Geoengineering Monitor website!
Track geoengineering projects with the Geoengineering Map!
What is geoengineering?
Geoengineering includes many different technologies. They are all risky, speculative and poised to be controlled by superpowers and wealthy corporations. None address the root causes of climate change.
Solar radiation manipulation (SRM)
Carbon dioxide removal (CDR)
Marine Geoengineering
Oceans are increasingly targeted for both geoengineering carbon dioxide removals such as ocean fertilisation and solar radiation manipulation such as marine cloud brightening.
Land-based geoengineering
Bioenergy with carbon capture and storage (BECCS) requires plantations the size of whole countries or sub-continents. Direct Air Capture requires huge land areas, energy and toxics. Reflecting sunlight by spreading glass beads on arctic ice sheets or genetically modifying vegetation imposes huge new risks.
Atmosphere and space geoengineering
Dimming the sun by continuously spewing pollution into the stratosphere or placing mirrors in space introduce unfathomable risks and are technologies that cannot be governed equitably and safely.
Learn more at the Geoengineering Monitor website!
Track geoengineering projects with the Geoengineering Map!
Take action - current campaigns and interventions
Support Alameda county to reject outdoor experimentation
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Fight loopholes at UNFCCC Article 6 negotiations
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Support the call for a Solar Geoengineering Non-Use Agreement
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