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New study says the world blew past 1.5 degrees of warming four years ago

"Limiting average global warming to 1.5 degrees Celsius, or 2.7 degrees Fahrenheit, above preindustrial levels has been the gold standard for climate action since at least the 2015 Paris Agreement. A new scientific study published in the peer-reviewed journal Nature Climate Change, however, suggests that the world unknowingly passed this benchmark back in 2020."

Not so great, but what's cool here is how they determined this: by analyzing strontium to calcium ratios in a species of sea sponge that lives for hundreds of years. Previously we'd only been able to determine ocean temperatures starting in 1850, when the industrial revolution was already underway.

This new analysis suggests that the pre-industrial oceans were cooler than had been previously understood, meaning we may be 20 years further along the global warming curve than we'd known. Even more reason to take dramatic action now.

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