Climate change could overexpose rare underwater "marimo" algae balls to sunlight, killing them off, according to a new study at the University of Tokyo. Marimo are living fluffy balls of green algae. The world's largest marimo can be found in Lake Akan in Hokkaido, Japan's northern main island.
source https://www.lifetechnology.com/blogs/life-technology-science-news/massive-marimo-algae-balls-at-risk-for-deadly-winter-sunburn