The ocean is hotter than ever. What does it mean?

The world's oceans have reached their highest temperature on record, as they suffer from both human-caused climate change and a strengthening El Niño. What does this tell us about the state of our climate system, and what does a hotter ocean mean for marine life and people on land? Climate Watch host Zhao Ying speaks with Dr. Samantha Burgess, Deputy Director of the Copernicus Climate Change Service.