There is danger looming. Some scientists believe that they have the answer to global warming by putting chemicals and minerals into the environment. There are no laws to prevent them taking action themselves and doing what they want. Apart from maritime laws that deal with political international matters few effective laws between countries exist.
A questionable activity is taking place. Iron is being dumped into oceans. This "ocean fertilization" absorbs carbon dioxide. Boosted fish stocks are promised. This of course is all theory. It is not proven fact.
The London Protocol is the section of international law that could end this activity. Countries could still legislate and do "scientific" dumping. Japan does this to kill whales to provide meat for human consumption. Australia is pushing for new London Protocol laws to prevent geoengineering of all kinds, because individual action is dangerous and could affect everyone in the future.
Critics say iron dumping will lead to an increase in toxic algae blooms. Furthermore, it will make the present acidification of the ocean worse. Any human action has side effects. Individual action is very dangerous as consequences are largely unknown. Once the environment is changed it is altered forever.