Ancient Upheavals Show How to Geoengineer a Stable Climate
In April of last year, the concentration of carbon dioxide in the Earth’s atmosphere reached 410 ppm. This is the highest in over 3 million years, and much higher than the pre-industrial average of 280 ppm. The last time CO2 levels were this high, in the middle Pliocene epoch, the average global temperature was around 3 °C greater than today, and sea levels were 25 meters higher. The time before that, in the middle Miocene, sea level was 40-50 meters higher.| Palladium Magazine
