In the Late Pliocene CO2 levels were similar to ours today (412 ppm). It was 3 to 4°C warmer and oceans 15-20 meters (50-65 feet) higher. There's a lag, but these consequences are now locked in.
Dire future etched in the past: CO2 at 3-million year-old levels
Martin Siegert, professor of geoscience at Imperial College London says,
"It's like a crazy experiment: Let's take that CO2 that took 100 m…
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