At present, the rise in seawater temperature has caused a series of bleaching events. Researchers are very worried about the fate of global corals. Researchers have found that zooxanthellae can use photosynthesis to produce the nutrients needed by itself and its hosts. When symbiotic algae called zooxanthellae, corals that lost colored algae gradually turned white, and bleaching occurred. If the bleaching continued, the only thing waiting for coral reefs would be death. From this we can deduce:. ['Limiting the rise in atmospheric temperature will at least give coral reefs some time to adapt.', 'Global warming causes slower and slower calcification of coral reef systems offshore.', 'The continued rise in temperature will lead to longer intervals between bleaching events.', 'Temperature rises cause shallow water corals to seek shelter in deeper waters.']