Net Zero

What It Means When Climate Scientists Say They're Certain

The use of the word ‘unequivocal’ in the IPCC’s latest report was no small step for science-speak.

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Scientists just made history by declaring, definitively and in unison, that climate change is caused by people. “It is unequivocal that human influence has warmed the atmosphere, ocean, and land,” they wrote in the first comprehensive report from the United Nations Intergovernmental Panel on Climate Change in nearly a decade.