1. carbon dioxide:At 415 PPM, There Is More Carbon Dioxide In The Air Now Than Before Humans Came Into Existence  India Times
  2. It's Official: Atmospheric CO2 Just Exceeded 415 ppm For The First Time in Human History  ScienceAlert
  3. CO2 in the atmosphere just exceeded 415 parts per million for the first time in human history  TechCrunch
  4. There is more CO2 in the atmosphere today than any point since the evolution of humans  CNN
  5. Scientists: Global carbon dioxide hits record level  WRAL Tech Wire
  6. View full coverage on Google News

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