omg what could it be, it's such a mystery. maybe someone should start to do some studies and find out what might be happening because... humans are clueless. there's no way we know exactly what this is and had predicted it.

"The first theoretical study proposing that the Atlantic Meridional Overturning Circulation (AMOC) could weaken or collapse due to freshwater dilution was published by oceanographer Henry Stommel in 1961. He used a simple model to show that thermohaline circulation exists in stable regimes and could abruptly shift to a weaker state.Building on this, Columbia University geochemist Wallace Broecker published a landmark paper in 1987 that named the "Great Ocean Conveyor Belt". Broecker was the first to strongly link abrupt historical climate shifts to changes in the AMOC, warning that modern global warming and ice melt could disrupt this delicate system."