The past seven years have been the hottest in recorded history, new data shows

But the fact that 2021 hasn’t rewritten the history books makes it even darker, said NASA climatologist Gavin Schmidt. It highlights how human greenhouse gas emissions, primarily from the combustion of fossil fuels, have fundamentally and irrevocably changed the planet. Even the not-so-bad years are dramatically worse than anything that could have been imagined a generation ago. Natural variations, like the cooling influence of La Niña, can hardly put a stop to the relentless trend of human-induced warming.

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