The current prognosis for our world's coral reefs is bleak. With ever warming, more polluted and acidic oceans, models predict that 70% to 90% of coral reefs will be lost by 2050. To date, there has not been a global system in place to monitor coral reefs under the stresses that may lead to their deaths. But scientists now have a tool to monitor the global health of coral reefs, bringing new hope to conservation efforts.