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Carbon dioxide levels are the highest they've been in 650,000 years

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Carbon dioxide levels in the atmosphere have reached a record high, according to new figures.

Scientists at Mauna Loa observatory in Hawaii said atmospheric levels of the climate change gas had hit 387 parts per million (ppm), the highest rate for 650,000 years.
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4 responses // Carbon dioxide levels are the highest they've been in 650,000 years

  • What I would now like to know is what was the climate like 650,000 years ago.
    Vierotchka
  • frozen I think?
    JMTJ
  • http://www.finfacts.ie/irelandbusinessnews/publish/arti...
    I doubt it very much, JMTJ.

    Excerpt from the article linked to below:

    Shafts of ancient ice extracted from Antarctica's frozen depths show that for at least 650,000 years three important heat-trapping greenhouse gases never reached recent atmospheric levels caused by human activities, scientists are reporting today.

    In an article in the journal Science titled Tiny Bubbles Tell All, Edward J. Brook says that during the past 200 years, humans have caused a remarkable change in the levels of several atmospheric greenhouse gases. We know this from direct measurements that started in the latter half of the 20th century, but for earlier times we rely on tiny samples of the atmosphere trapped in polar ice. Coring the polar ice sheets provides access to these samples and allows us to place modern changes in the context of long-term natural cycles in greenhouse gases.
    Vierotchka
  • This is old news, it dates from November 2005.

    http://www.heatisonline.org/contentserver/objecthandler...
    Vierotchka

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