Over the course of a year, one hundred square meters of aquatic plants in a biological pool can assume about 100 kg CO2.

In other words, each biological pool contributes to the fixation of carbon dioxide (because almost all of them have at least 100 m2 of area of ​​aquatic plants). But we have to be correct while doing these exemplary calculations. We also have to consider how much CO2 a biological pool emits during a year. As we do not have direct studies on this issue, we can see what happens in natural lakes with CO2.
Compared to oceans that cover two thirds, the millions of inland lakes represent only 3% of the Earth’s surface. But in total, these lakes overtake the oceans in terms of their effectiveness as CO2 sinks. As a scientific study by limnologists (freshwater biologists) at Uppsala University in Sweden indicates: “Despite its small size, annual carbon storage in lakes, reservoirs and other artificial waters is bigger than in sediments from all the world’s oceans. ”(Published in Nature magazine in 2019).

The amount of CO2 that a biological pool sets over a year is bigger than the amount of CO2 that the process of decomposing plants into organic biomass returns to the atmosphere. In short words, biological pools are effective sinks of carbon dioxide.