Marine cloud brightening (MCB) is a proposed climate engineering method that involves spraying seawater droplets into the atmosphere over the ocean to increase cloud reflectivity and reflectance of the sun's radiation back to space. While MCB has the potential to mitigate some of the effects of climate change, modelling studies have shown that it can also have negative unintended consequences.

Increased storm activity: One of the potential negative consequences of MCB is that it could lead to increased storm activity. This is because MCB would cool the ocean surface, which could in turn strengthen atmospheric instability and increase the likelihood of storms forming.

Changes in precipitation patterns: MCB could also lead to changes in precipitation patterns. For example, it could cause more rainfall over the ocean and less rainfall over land. This could disrupt ecosystems and lead to water shortages in some areas.

Ocean acidification: MCB could also lead to ocean acidification, as the increased absorption of carbon dioxide by the ocean water would lower its pH. This could harm marine life and disrupt ecosystems.

Changes in atmospheric chemistry: MCB could also lead to changes in atmospheric chemistry. For example, it could increase the concentration of ozone in the lower atmosphere, which could be harmful to human health and plant life.

The potential risks and benefits of MCB are still being studied. It is important to carefully consider these risks before any decision is made to deploy this technology on a large scale.

Additional studies on the potential consequences of MCB are needed to further our understanding of the risks and benefits of this climate engineering method.