How can it be that microscopic algae, which have proliferated excessively due to nitrogen and phosphorus concentrations in the water, affect the formation of rain? Imagine a heated sauna. When you pour water on the hot stones, no clouds of moist air are formed. Water droplets settle and collect on surfaces – the walls and windows of the sauna. Similarly, surfaces are needed in the air for water droplets to collect upon. It has been researched that algae in the air form dispersed particles related to their metabolism, which in turn attract water. It also rains more in and around cities because tiny air pollution particles form there, which attract water. It does not really affect the amount of moisture in the air, but rather changes exactly where the rain might fall. Conversely, if precipitation occurs, clouds also form, which affect the Earth's surface temperature. Wind arises from the temperature difference in different places.
We should learn how to utilise eutrophication, or the excessive proliferation of algae, which causes problems. Algae grow, multiply excessively, and rot, thereby consuming the oxygen present in the water. In the Baltic Sea, there are fewer cod and other fish that have lived here since ancient times. But perhaps we could use algae for food, in medicine, or to generate energy?