Experts say the world has already passed the safe level of carbon dioxide in the atmosphere for coral reefs, and even the most ambitious carbon cuts planned for coming decades will fail to save them.

专家说，对珊瑚礁来说，全球大气二氧化碳浓度已经超过了安全浓度，即使最有雄心的未来十年碳减排计划挽救不了它们。

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"We have already seen that the oceans are becoming more acidic as a result of the carbon dioxide uptake, with potential repercussions for the underwater food chain and coral reefs, " he said.

BBC: Greenhouse gases hit record high

"We've already seen that the oceans are becoming more acidic as a result of the carbon dioxide uptake, with potential repercussions for the underwater food chain and coral reefs, " Jarraud said in a statement.

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Would we care more if we could see the higher concentrations of carbon dioxide being absorbed into our oceans, making seawater more acidic, endangering coral reefs and marine life and threatening to fundamentally disrupt ocean ecosystems and food webs?

CNN: What if carbon dioxide were as black as oil?