Protecting Coral Reefs: A Global Effort from the Maldives to Ireland
The world is witnessing a critical moment in the battle against climate change as the die-off of warm-water coral reefs, a significant climate tipping point, is under discussion at COP30. This global concern is prompting urgent action to safeguard these vital ecosystems.
Scientists have long emphasized the importance of adhering to the Paris Agreement's 1.5C warming threshold to minimize coral reef loss, which supports a quarter of marine life. However, recent developments have revealed a dire situation.
The International Coral Reef Initiative, currently chaired by Saudi Arabia, reports that 84% of the world's coral reefs have been affected by the ongoing fourth global bleaching event, the most widespread and severe on record. This alarming statistic highlights the urgency of the situation.
The second Global Tipping Points report, released last month, further underscores the gravity. Based on the work of over 160 scientists, it confirms that the central estimate of the thermal tipping point for tropical corals, 1.2C of global warming, has already been surpassed.
Tim Lenton, Director of the Global Systems Institute at the University of Exeter, England, explains, 'We've witnessed an unprecedented coral bleaching event affecting 80% of low-latitude reefs, confirming our deduction that the tipping point for corals is likely below 1.5C.'
COP30 is exploring solutions, including expanding protected marine areas and supporting innovative restoration methods. One such approach is assisted evolution and the development of 'super corals,' which involves controversial gene modification in labs to enhance heat tolerance.
Coral Planting in the Maldives
The Maldives, comprising thousands of low-lying coral islands, faces significant risks due to coral bleaching and degradation. Despite the challenges, the country is taking proactive measures.
Tourists visiting the Maldives can now participate in coral planting, contributing to the creation of coral gardens or man-made reefs. Katelyn Hegarty-Kelly, a Managing Marine Biologist at Reefscapers in the Maldives, oversees this initiative.
Based at the Sheraton Full Moon Resort and Spa on Furanafushi Island in the North Male Atoll, tourists can sponsor and grow their own coral reef frames. These structures are then added to coral gardens, with guests receiving photos of their developing corals every six months.
Hegarty-Kelly emphasizes the rewarding nature of the project, allowing guests to feel connected to the environment. However, she acknowledges the challenges, including rising sea temperatures that impacted last year's mass coral bleaching event.
The Maldives' economy heavily relies on tourism, but air travel contributes significantly to carbon emissions, exacerbating global warming and rising sea temperatures. Man-made reef gardens, while beneficial, are seen as a small part of the solution.
Despite the difficulties, the project offers a sense of control and contribution to a larger cause. Hegarty-Kelly notes, 'We need more action from those in power, but we're doing our best.'
Cold-Water Corals in Ireland
Coral reefs are found in over 100 countries, with approximately 50% of all coral species thriving in deep, dark waters, including off Ireland's southwest coast in the Porcupine Bank Canyon on the Atlantic continental shelf.
Dr. Aaron Lim, a Senior Lecturer at the Department of Geography at UCC, clarifies that these are cold-water coral mounds or reefs, distinct from the well-known Great Barrier Reef.
The canyon, located 300kms west of An Daingean in Co. Kerry, is approximately 900 meters deep. These reefs, while well-studied, have only been accessible for research in the past two decades due to their depth, requiring the use of Remotely Operated Vehicles for exploration.
Underwater robotics have revealed pollutants, including plastic, rubbish, and fishing gear, around these reefs, with microplastics and microfibers found on and within the corals. Cold-water corals, lacking a symbiotic relationship with algae, rely on ocean particles for sustenance, making them vulnerable to microplastics from wastewater and washing machine runoff.
Early research suggests that this pollution may inhibit coral growth over time. Climate change is also contributing to faster current speeds, reducing the corals' ability to trap food and potentially leading to erosion.
Dr. Lim emphasizes the importance of preserving these corals, which are biodiversity hotspots in otherwise barren ocean areas. They are crucial for Ireland's seafood economy, valued at €1.3bn in GDP, and play a significant role in sustaining fisheries and healthy ecosystems.
