Kees van der Leun on Nostr: I learned from Katharine Hayhoe that it's the highest CO2 concentration since around ...

I learned from Katharine Hayhoe that it's the highest CO2 concentration since around 15 million years. According to this article, it's 14 million years, so I stayed on the safe side:
https://news.climate.columbia.edu/2023/12/07/a-new-66-million-year-history-of-carbon-dioxide-offers-little-comfort-for-today/