They suck in huge amount of carbon dioxide and thus maintaining the level of carbon dioxide in our atmosphere. But the continuous rise of carbon dioxide level due to anthropogenic activities causes the oceans to become acidic. Low water pH is detrimental to coral reefs and aquatic lives, annihilating delicate reefs and fish eggs.
There is one creature that could help save the reefs-- sea cucumber.
The excrement of this humble creature contains calcium carbonate (CaCO3), which is an essential component of coral.
"To survive, coral reefs must accumulate CaCO3at a rate greater than or equal to the CaCO3 that is eroded from the reef [by ocean acidification]," Maria says.
The waste also provides nutrients to assist coral growth.