Current Status of South African Reefs
4 CO2 Emissions & Coral Reefs: Record Heat in 2023 South African reefs remain relatively unscathed by coral bleaching compared to other global sites, thanks to their distinct reef formations and ocean currents. Nevertheless, it’s crucial to implement a sustainable and non-invasive strategy to preserve southern African coral reefs before they face irreversible damage.
Causes of Coral Bleaching
The primary culprit behind coral bleaching is the rise in ocean temperatures, largely a result of climate change. Additional factors include pollution and runoff, where heavy rainfall dilutes ocean salinity and carries pollutants to coastal corals, contributing to bleaching.
As oceans absorb carbon dioxide (CO2), their acidity increases, compromising the ability of reef-building corals to form their skeletal structures, which are vital for reef development. This weakening of structures leaves corals more vulnerable to diseases and storm damage.
Recent reports from leading scientific bodies highlight record heat levels on Earth over the past year. Experts warn that these record numbers signal an intensification of climate change, which is dangerously close to surpassing the critical 1.5°C rise since pre-industrial times that nations have been striving to avoid.
Coral Reefs at Risk in 2024
Ove Hoegh-Guldberg, a prominent coral scientist, foresees severe health challenges and extensive coral die-offs around the world in 2024. The intensifying marine heatwaves, coupled with climate change, are likely to push corals to a crucial tipping point.
Changes in the upper ocean, linked to widespread coral bleaching since the early 1980s, are accelerating. Rising sea surface temperatures, driven by marine heatwaves and phenomena like the El Niño–Southern Oscillation, are reaching unprecedented levels. Unless greenhouse gas emissions are curtailed, experts predict ongoing coral bleaching and mortality in the Indo-Pacific region throughout 2024.
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