A series of records on temperature, ocean heat, and Antarctic sea ice are 'unprecedented', some scientists say.
Directly attributing this heatwave to climate change is complex, but that work is ongoing, Prof Schmidt says.
"Our models have natural variability in them, and there are still things appearing that we had not envisaged, or at least not yet," she adds. "People tend to think about trees and grasses dying when we talk about heatwaves. The Atlantic is 5C warmer than it should be - that means organisms need 50% more food just to function as normal," she says.The area covered by sea-ice in the Antarctic is at record lows for July. There is an area aroundAlarm bells are ringing for scientists as they try to unpick the exact link to climate change.
"You can say that we've fallen off a cliff, but we don't know what's at the bottom of the cliff here," she says.
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