Almost every shallow-water coral reef on the planet faces ecosystem collapse by 2075, UN advisors say

In its first global assessment, the world authority on threatened wildlife classified 96% of coral reef systems as "critically endangered." YEREVAN, Armenia(AFP)—Nearly all of the world's shallow-water coral reefs face an "extremely high risk" of collapse by 2075 due to climate change, the International Union for Conservation of Nature (IUCN) warned Thursday. In the first global assessment of its kind, the world authority on threatened wildlife classified 96 per cent of the planet's coral reef systems as "critically endangered" -- its highest risk category.

Corals are heat sensitive and particularly vulnerable to human-driven climate change, which is warming the world's oceans and increasing the frequency and intensity of damaging bleaching events. "The risk of coral reef collapse is escalating, but this must be a wake-up call rather than a cause for despair," said Mishal Gudka, scientific lead of the IUCN Red List of Coral Reef Ecosystems assessment. "Coral reefs have shown a remarkable ability to bounce back from devastating bleaching events," said Gudka, who is also research director at Coastal Oceans Research and Development in the Indian Ocean (CORDIO) East Africa, a conservation organisation.

For their assessment, researchers used the "middle-of-the-road" scenario from the UN's panel of climate experts that projects global temperatures rising 2.7C above pre-industrial levels by 2100. The world is on track for 2.6C warming this century under current global commitments to cut planet-heating emissions, the United Nations warned Wednesday. "Heat stress from climate change is the single most consistent threat driving coral reef decline worldwide," the IUCN said in a statement.

Overfishing is also hurting corals as certain herbivores and predators help control algae and maintain an ecological balance, the organisation said. The overexploitation of parrotfish and other groupers threatens 63 percent of coral reef ecosystems. Coastal development, pollution, tourism and more frequent storms are among other threats.

- Critically endangered coral - The IUCN's analysis examined 127 tropical and subtropical coral systems covering 188,362 square kilometres. The world's largest and most biodiverse coral reefs are among those classified as critically endangered -- Australia's Great Barrier Reef, the Coral Triangle in southeast Asia and the western Pacific, the Caribbean's Mesoamerican Barrier Reef System, and the Red Sea coral reefs. A reef ecosystem collapses when hard corals -- which build its living fo…

Corals are highly sensitive to heat and face growing threats from human-driven climate change, which warms oceans and intensifies damaging bleaching events. (AFP pic)YEREVAN: Nearly all of the world's shallow-water coral reefs face an "extremely high risk" of collapse by 2075 due to climate change, the International Union for Conservation of Nature (IUCN) warned Thursday.In the first global assessment of its kind, the world authority on threatened wildlife classified 96% of the planet's coral reef systems as "critically endangered" – its highest risk category.Corals are heat sensitive and particularly vulnerable to human-driven climate change, which is warming the world's oceans and increasing the frequency and intensity of damaging bleaching events."The risk of coral reef collapse is escalating, but this must be a wake-up call rather than a cause for despair," said Mishal Gudka, scientific lead of the IUCN Red List of Coral Reef Ecosystems assessment."Coral reefs have shown a remarkable ability to bounce back from devastating bleaching events," said Gudka, who is also research director at Coastal Oceans Research and Development in the Indian Ocean (CORDIO) East Africa, a conservation organisation.For their assessment, researchers used the "middle-of-the-road" scenario from the UN's panel of climate experts that projects global temperatures rising 2.7°C above pre-industrial levels by 2100.The world is on track for 2.6°C warming this century under current global commitments to cut planet-heating emissions, the UN warned Wednesday."Heat stress from climate change is the single most consistent threat driving coral reef decline worldwide," the IUCN said in a statement.Overfishing is also hurting corals as certain herbivores and predators help control algae and maintain an ecological balance, the organisation said.The overexploitation of parrotfish and other groupers threatens 63 percent of coral reef ecosystems.Coastal development, pollution, tourism and more frequent storms are among other threats.Critically endangered coralThe IUCN's analysis examined 127 tropical and subtropical coral systems covering 188,362 square kilometres.The world's largest and most biodiverse coral reefs are among those classified as critically endangered – Australia's Great Barrier Reef, the Coral Triangle in Southeast Asia and the western Pacific, the Caribbean's Mesoamerican Barrie…