RT @LeonSimons8: Yesterday was the first day CO₂ at Mauna Loa was 425 ppm. This is:
-likely the first time in the past 800,000 years.
-possibly not seen in over 3 million years (mid-pliocene warm period).
-A CO₂ forcing equal to 2.5-4°C of warming and 5-25 meters higher global sea level. https://t.co/amxvxifA7l

🐦🔗: https://n.respublicae.eu/ParHolmgren/status/1652357347090526209