6 May 2015, RTCC: Fossil fuels just pushed CO2 levels to a 3 million-year high: Global concentrations of greenhouse gases surpass “significant milestone”, US climate science agency says, the amount of carbon dioxide in the Earth’s atmosphere exceeded 400 parts per million in March, the National Oceanic and Atmospheric Administration reported today. That’s the most in 57 years of measurements, a near 50% rise on pre-industrial levels, and probably the highest since the Pliocene Epoch, 2.6-5.3 million years ago. Read More here