- The Posidonia meadows of the Balearic Islands is the largest and longest living organism in the world. It is 8 km long and is 100,000 years old.
- 1 hectare of Posidonia absorbs 1.2 kilos of nutrients per year equivalent to treated effluents of 200 people.
- 1 hectare of the Posidonia meadow produces 100,000 liters of oxygen per day.
- Posidonia acts as a "carbon sink" since one hectare of meadow absorbs 830 tons of carbon and in contrast a tropical forest stores about 300 tons per hectare. This is almost Three times the amount per hectare, which is why protection is vital to climate change.