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What is Coral Bleaching?
The vibrant colours of corals come from algae that live inside their tissues. It gives corals energy, allowing them to grow and flourish.
When water temperatures are too hot for too long, corals expel the algae which causes them to turn white.
Though they can recover from bleaching, if bleached corals are exposed to warmer water for eight weeks or more, they become vulnerable to diseases and begin to die.
Causes of Coral Bleaching
Coral bleaching is the ghostly face of climate change. Corals are paying the price for our reliance on mining and burning fossil fuels like coal and gas.
As carbon pollution is emitted into Earth’s atmosphere, it traps heat and causes temperatures to rise. The ocean then becomes warmer, resulting in heatwaves that cause stress to corals.
Ocean heatwaves can destroy entire reef ecosystems and the marine life that depend on healthy, thriving corals.
Back-to-back mass bleaching events in 2016 and 2017 wiped out half of the shallow corals on the Great Barrier Reef.If carbon pollution isn’t reduced, climate change is expected to cause more frequent and severe coral bleaching on the Reef.
Coral reefs are incredibly resilient but their full recovery can take decades. That’s why it’s important to take action and make a rapid shift towards renewable energy before it’s too late.