Abstract
Marimo is revealed to be formed by the rotation of Marimo itself due to the wind waves, which enhances photosynthesis over the entire Marimo-surface. Marimo was registered as a special natural treasure in 1952 because Marimo exists in Lake Akan only all over the world. Recently, it is found that meteorological conditions have been changing due to climate change, which may also change wind speed and wind direction. Therefore, the decrease in wind speed would reduce the occurrence of wind waves. This study thus aims to project wind speed by using GCMs. As a result, the projection demonstrated that wind speed increases in the future, which may enhance the rotation of Marimo.