The Guardian view on protecting corals: what lies beneath matters too | Editorial

Mass bleaching events go largely unseen, but a quarter of marine species and half a billion humans depend upon reefsWhen images of the climate emergency's impact are so visceral and so widespread, it is easy to neglect what we cannot see. The shocking photographs and video footage of wildfires in Hawaii and Greece, and floods in China, along with the terrible loss of life and testimony from those who fled, are beginning to bring home the contribution of global heating to such disasters - even if people, and especially businesses and governments, may be slow to accept the truth and even slower to act on it.Yet our eyes cannot fully capture the devastation in Hawaii, and it does not end where its shores meet the sea. Beneath the surface of the water, sediment runoff may smother coral polyps and block sunlight, affecting the growth of colonies, experts warn. This is only one element of a broader disaster now unfolding, which scientists fear may soon be global and yet which has generated relatively little attention or alarm. Corals in countries across Central America, North America and the Caribbean are suffering significant bleaching as they experience unprecedented levels of heat stress due to record ocean temperatures, and there are similar warnings about reefs off northern Vietnam and southern China. In Florida, some sites have reported total loss of all corals. Continue reading...