We have reached a new record. For the first time in 800,000 years the atmospheric levels of carbon dioxide have reach 400 parts per million. For 1000s of years, the atmosphere has remained under 300 ppm of carbon dioxide. We were around 315 ppm in 1960. The rate of growth continues to grow.
Read more at: Scientific American: 400 PPM: Carbon Dioxide in the Atmosphere Reaches Prehistoric Levels By David Biello (May 9, 2013)