Das Great Barrier Reef, das größte Korallenriffsystem der Welt, ist durch den Klimawandel, die Verschmutzung und die Überfischung stark bedroht. Steigende Meerestemperaturen führen zur Korallenbleiche, bei der die Korallen ihre leuchtenden Farben und lebenswichtigen symbiotischen Algen verlieren. Es gibt Bemühungen zum Schutz und zur Wiederherstellung dieses Naturwunders, das Tausende von Meeresarten beheimatet.
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