Reefs around the world have suffered from mass bleaching events for three consecutive years. ![]() Coral bleaching events often lead to the death of large amounts of corals. If corals are bleached for prolonged periods, they eventually die. A spike of 1–2☌ in ocean temperatures sustained over several weeks can lead to bleaching, turning corals white. When conditions such as the temperature change, corals expel the symbiotic algae living in their tissues, responsible for their colour. ![]() This has led to unprecedented mass coral bleaching events which – combined with growing local pressures – have made coral reefs one of the most threatened ecosystems on Earth. ![]() Anthropogenic greenhouse gas emissions have caused an increase in global surface temperature of approximately 1☌ since pre-industrial times.
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