‘Unprecedented’ Ocean Heat Waves in 2023 Suggest Tipping Point

The world’s oceans experienced a staggering amount of warming in 2023, as vast marine heat waves affected 96% of their surface, breaking records for intensity, longevity and scale, according to a new study.

That could mark a turning point in the way the oceans behave, potentially signaling a tipping point after which average sea temperatures will be reset higher and some ecosystems may not recover, say the authors of the study, which was published Thursday in the journal Science.

“The ocean going to a new normal — that controls everything,” said Zhenzhong Zeng, an Earth systems scientist at China’s Southern ...