Tag Archives: Pliocene

As has been reported everywhere, one earthly species has changed the climate here on earth, driving warming CO2 levels (briefly) to 400 parts per million. When was the last time this happened? As Climate Central reported on May 3, there is no single, agreed-upon answer to when CO2 concentrations were last at this level, as studiesContinue reading “Live from the Pliocene: 400 ppm in 2013”