"We have known since the calculations of Nobel prize-winning physical chemist Svante Arrhenius in the 1890s of the impact increasing CO2 would have on temperature," Hayhoe said, citing scientific literature from 1896. YES - 1896. That's how long we've known. factcheck.afp.com/doc.afp.com....

— Katharine Hayhoe (@katharinehayhoe.com) 2025-12-17T16:47:01.542Z

And, Svante Arrhenius’s 1896 estimates of climate sensitivity fall within the range of those made by today’s models. He famously underestimated how fast the effects of increased CO2 would appear because he could not fathom how much coal we would burn.

— Ben Harding (@blhiiii.bsky.social) 2025-12-17T16:52:30.310Z