Marine ecosystems in World Heritage sites cover over 2 million km2. They are home to exceptional biodiversity and harbour over 10% of all known marine species. They also play a crucial role in climate regulation storing 15% of the world’s blue carbon assets in seagrasses, tidal marshes and mangroves. Climate change has become the biggest threat to the conservation of the 50 marine sites on UNESCO’s World Heritage List. Nearly all coral reefs in World Heritage sites are likely to face annual bleaching events by 2050. Urgent action is needed to safeguard these unique places for future generations.
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