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  lobal carbon dioxide in atmosphere passes milestone level
  
  Climate warming greenhouse gas reaches 400 parts per million for the first time in human history
  
  Hawaii's Mauna Loa observatory, where record CO2 increases are being documented.
  
  For the first time in human history, the concentration of climate-warming carbon dioxide in the
  
  atmosphere has passed the milestone level of 400 parts per million (ppm). The last time so much
  
  greenhouse gas was in the air was several million years ago, when the Arctic was ice-free,
  
  savannah spread across the Sahara desert and sea level was up to 40 metres higher than today.
  
  These conditions are expected to return in time, with devastating consequences for civilisation,
  
  unless emissions of CO2 from the burning of coal, gas and oil are rapidly curtailed. But despite
  
  increasingly severe warnings from scientists and a major economic recession, global emissions
  
  have continued to soar unchecked.

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