"The record global warmth of the past two years has sent the planet well into uncharted territory," Richard Allan,
a climate scientist from the UK's University of Reading, told AFP.
What occurred was "at the limit of what we would expect based on existing climate models",
Sonia Seneviratne,
a climatologist from ETH Zurich in Switzerland, told AFP.
"But the overall long-term warming tendency is not unexpected" given the amount of fossil fuels being burned, she added.
This month, the US National Oceanic and Atmospheric Administration said the Arctic tundra,
after locking away C02 for millennia,
was becoming a net source of emissions.
Oceans, which have acted as a massive carbon sink and climate regulator,
were warming at a rate scientists
"cannot fully explain",
said Johan Rockstrom of the Potsdam Institute for Climate Impact Research.
"Could this be a first sign of a planet starting to show a loss of resilience?
We cannot exclude it," he said last month.
https://www.sciencealert.com/even-nasa-cant-explain-the-alarming-surge-in-global-heat-were-seeing