Carbon dioxide in atmosphere hits historic high..Science News

  The level of carbon dioxide in  the atmosphere has broken above  400 parts per million for the first time in human history, US monitors announced Friday, indicating that climate change  has reached a new high.

The data showing that the average C02 was 400.03 as of May 9 was posted  online by the National Oceanic and Atmospheric Administration’s monitoring  center in Mauna Loa, Hawaii.
   The air measurements represent conditions over the Pacific Ocean, and the  data is still considered “preliminary,” pending quality control and  recalibration checks, NOAA said.

  A separate monitor at the Scripps Institution of Oceanography in San Diego,  California has not yet returned the same reading, with its latest data on May 9  showing that atmospheric carbon dioxide was at 399.73 parts per million.

  The Earth has not seen these levels of C02 in millions of years, according  to Bob Ward, policy and communications director at the Grantham Research  Institute on Climate Change and the Environment at London School of Economics  and Political Science.

  “The Earth has not experienced this level of carbon dioxide in the  atmosphere for about three million years, when global average temperature was  two to three centigrade degrees higher than pre-industrial levels, the polar  ice caps were much smaller and global sea level was about 20 meters (yards)  higher than today,” Ward said.

  “We are creating a prehistoric climate in which human societies will face  huge and potentially catastrophic risks.”

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