Ocean heatwaves are intensifying globally, with all waters around Australia experiencing above-average temperatures in winter 2025. This warming is linked to events like South Australia’s toxic algal bloom. In 2023, extreme heat in the North Atlantic exceeded chart limits. Research by Professor Matthew England (UNSW) highlights that the Atlantic Meridional Overturning Circulation (AMOC), a vital system that moves warm, nutrient-rich water through the Atlantic, has been slowing over the past 50 years, with global consequences for climate and marine ecosystems.

Listen to the complete ABC National Radio broadcast recording presented by Robyn Williams here: https://www.abc.net.au/listen/programs/scienceshow/oceans-are-becoming-hotter-long-term-trends-show/105603022