None of them can explain the enduring spike in global air and ocean temperatures that began last year. He calls it 'an unprecedented knowledge gap,' noting that if the anomaly does not diminish by August, as suggested by past El Niño events, 'the world will be in uncharted territory.'
Threat level: The most worrying possibility, and it is just a hypothesis, is that climate change has 'fundamentally alter[ed] how the climate system operates,' without warning, Schmidt wrote.
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