[BBCNature]
Theseunderwaterworldsareevenmorebiodiversethantropicalrainforests–andjustlikerainforests,coralreefsfacesignificantthreatstotheirexistence.Sowhat’scausingsomanyoftheseincredibleecosystemstodieout–andwhat’sbeingdonetopreservethem?
Imagineasupercitysobigthatitcanbeviewedfromspace.A