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Climate Lesson Update: May 2013

50 years ago, the first atmospheric CO2 data taken at the Mauna Loa Observatory, Hawaii measured 315 ppm. Two weeks ago, the observatory made an announcement: we had nearly averaged 400ppm for one consecutive month . The last time that atmospheric CO2 concentrations reached 400ppm was more than 2 million years ago in the Pliocene […]

The Power of Partnership

Letter from the Executive Director Carbon dioxide levels in the Arctic have now reached 400 ppm and climate scientists consider 350 ppm to be the safe level to avoid catastrophic changes. What does this mean? It means a number of important things – but what stands out is that the amount of CO2  in the […]