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CO2 Tops 400ppm at Mauna Loa as Forecast

Posted by feww on May 11, 2013

Atmospheric Carbon Dioxide Crosses 400PPM Milestone at Hawaii Observatory

On April 3, FIRE-EARTH forecast that the weekly average atmospheric CO2 at Mauna Loa could hit 400ppm by May 2013.

Last 5 days of daily average CO2

May 09 – 400.03  |  May 08 – 399.42  |  May 07 – 399.59  |  May 06 – 399.43 |  May 05 – 399.47  |

This is the first time the amount of carbon dioxide in the atmosphere in Hawaii tops 400ppm since measurement began in 1958, according to ESRL data.

The rise to 400ppm level of the atmospheric carbon dioxide represents yet another appalling milestone in the brief history of the homo ignarus.

The last time Earth’s atmosphere contained this much carbon dioxide was probably as many as 5 million years ago.

CO2 Daily and Weekly Means at Mauna Loa.  The weekly mean (red bar) is simply the average of all days in the week for which a background value could be defined. The average standard deviation of day to day variability, calculated as the difference from the appropriate weekly mean, equals 0.38 ppm for the entire record. As a visual aid, the blue lines present monthly means of background data as they are presented under Recent Monthly CO2 at Mauna Loa. [Source: ESRL/NOAA]

Up-to-date weekly average CO2 at Mauna Loa

  • Week of April 28, 2013: 399.58 ppm
  • Weekly value from 1 year ago: 396.81 ppm
  • Weekly value from 10 years ago: 378.50 ppm

Recent Global CO2

  • February 2013: 395.98 ppm
  • February 2012: 393.05 ppm

Recent Monthly Average Mauna Loa CO2

  • March 2013: 397.34 ppm
  • March 2012: 394.45 ppm

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