Zürcher Nachrichten - Countries pledge to raise $12 billion to help coral

The "Coral Reef Breakthrough" was announced by a network of nations that account for three-quarters of the world's coral reefs.

It includes a pledge to double the area of coral reefs under protection from the current estimate of around 60,000 square kilometres (23,000 square miles), and restore some 10,500 sq km.

The plan, announced by the International Coral Reef Initiative, includes a headline pledge to secure $12 billion in investments from public and private sources by 2030.

"This investment will enable more effective coral reef management including water quality management, coastal management, and local and regional regulations," the group announced.

Still, that figure compares with the estimated $174.5 billion a year that a 2020 study estimated was needed to plug the gap in funding for ocean conservation more broadly.

The pledge comes with coral reefs around the world under particularly acute stress because of record warm seas this year.

Marine heatwaves -- episodes of abnormally high water temperatures -- have become more frequent and intense.

Oceans have absorbed 90 percent of the excess heat produced by human activity since the dawn of the industrial age, according to scientists.

This excess heat continues to accumulate as greenhouse gases build up in the Earth's atmosphere, mainly from burning oil, gas and coal.

Warmer water can cause stressed corals to expel the algae that lives in symbiosis with them, providing them with nutrients and giving them colour.

This bleaching process can result in coral death if temperatures remain too high for the algae to return, devastating the ecosystems that rely on reefs.

Mass bleaching has already been reported this year in Florida, with concern that the worst may be ahead as the El Nino seasonal weather pattern is often associated with bleaching events.

A.Ferraro--NZN