{"id":1946,"date":"2006-07-11T04:39:00","date_gmt":"2006-07-11T04:39:00","guid":{"rendered":"http:\/\/www.patheos.com\/blogs\/drishtikone\/2006\/07\/inconvenient-truth-ice-ages-and-global-warming\/"},"modified":"2006-07-11T04:39:00","modified_gmt":"2006-07-11T04:39:00","slug":"inconvenient-truth-ice-ages-and-global-warming","status":"publish","type":"post","link":"https:\/\/www.patheos.com\/blogs\/drishtikone\/2006\/07\/inconvenient-truth-ice-ages-and-global-warming\/","title":{"rendered":"An Inconvenient Truth: Ice Ages and Global Warming"},"content":{"rendered":"\n<\/head>

I<\/span> haven\u2019t seen Al Gore\u2019s movie \u201cAn Inconvenient Truth\u201d, although it is high on my agenda to see. Here is a blog post on this movie on \u201cBlog or Die\u201d. The author brings out an interesting point based on the chart of the Ice-Ages and the level of Oxygen\/CO2. <\/a><\/p>\n

\n

The movie presents many facts and draws conclusions. I want to separate out what is fact from what I have questions about.<\/p>\n

Fact List:<\/p>\n

    \n
  1. Carbon dioxide is a greenhouse gas. That means that CO2<\/sub> tends to allow light through, but not heat. That\u2019s a little like when you leave your car windows up on a sunny day. The light streams in through the windows, but the heat doesn\u2019t radiate out through glass as well.<\/li>\n
  2. There is twice as much CO2<\/sub> in the atmosphere than there has been at any time in the last 600,000 years. We know this because there are ice core samples taken in the Antarctic. Ice is deposited in recognizable annual layers, and schentists can measure the CO2<\/sub> in the various layers.<\/li>\n
  3. There is a strong correlation between the amount of CO2<\/sub> in the atmosphere and the global temperature. The global temperature can be inferred through the ratio of two isotopes of Oxygen in the ice cores. One can see by looking at a time-series chart that CO2<\/sub> in the atmosphere tracks temperature.<\/li>\n
  4. The earth is getting warmer and ice is melting. I\u2019ll talk more about that below.<\/li>\n<\/ol>\n

    Ok, that\u2019s it for facts from the movie. Now for some analysis.<\/p>\n

    The earth is getting warmer. I borrowed my kid\u2019s college geology book. It has a nice chart based on core samples from the Indian Ocean, showing the temperature pver 500,000 years inferred from Oxygen isotope ratios.<\/p>\n

    \"Global
    Image from     The Earth Through Time<\/a> Eighth Edition by Harold Levin, John Wiley & Sons Publishers, 2006. <\/a><\/p>\n

    There is a clear pattern of ice ages every 100,000 years or so. You remember ice ages? Huge areas of North America all covered with ice? Well that ice is melting. It\u2019s been melting for ten thousand years. In fact, after every ice age (see chart), there follows a relatively rapid temperature rise. If you look at today\u2019s high temperatures, it looks pretty much like 130,000 years ago. Now here\u2019s the interesting part: after the last ice age, it got a bit hotter than it is today!<\/p>\n

    So here\u2019s one place where the CO2<\/sub> \/ temperature correlation breaks down. There\u2019s twice as much CO2<\/sub> in the atmosphere today than 130,000 years ago, but it was a bit hotter then.<\/p>\n

    <\/p><\/blockquote>\n

    \"Blog<\/a><\/p>\n\n

    \n
    \n Technorati<\/span> :     Global Warming<\/a>, Inconvenient Truth<\/a><\/span>
    Del.icio.us<\/span> :     Global Warming<\/a>, Inconvenient Truth<\/a><\/span>
    Ice Rocket<\/span> :     Global Warming<\/a>, Inconvenient Truth<\/a><\/span>
    Flickr<\/span> :     Global Warming<\/a>, Inconvenient Truth<\/a><\/span>
    Buzznet<\/span> :     Global Warming<\/a>, Inconvenient Truth<\/a><\/span>
    43 Things<\/span> :     Global Warming<\/a>, Inconvenient Truth<\/a><\/span> <\/p>\n

    <\/p>\n

    var dc_AdLinkColor = \u2018orange\u2019 ;
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    <\/p>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"

    I<\/span> haven’t seen Al Gore’s movie “An Inconvenient Truth”, although it is high on my agenda to see. Here is a blog post on this movie on “Blog or Die”. The author brings out an interesting point based on the chart of the Ice-Ages and the level of Oxygen\/CO2. <\/a><\/p>\n

    \n

    The movie presents many facts and draws conclusions. I want to separate out what is fact from what I have questions about.<\/p>\n

    Fact List:<\/p>\n

      \n
    1. Carbon dioxide is a greenhouse gas. That means that CO2<\/sub> tends to allow light through, but not heat. That’s a little like when you leave your car windows up on a sunny day. The light streams in through the windows, but the heat doesn’t radiate out through glass as well.<\/li>\n
    2. There is twice as much CO2<\/sub> in the atmosphere than there has been at any time in the last 600,000 years. We know this because there are ice core samples taken in the Antarctic. Ice is deposited in recognizable annual layers, and schentists can measure the CO2<\/sub> in the various layers.<\/li>\n
    3. There is a strong correlation between the amount of CO2<\/sub> in the atmosphere and the global temperature. The global temperature can be inferred through the ratio of two isotopes of Oxygen in the ice cores. One can see by looking at a time-series chart that CO2<\/sub> in the atmosphere tracks temperature.
      \n","protected":false},"author":1517,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,27,57,79],"tags":[],"class_list":["post-1946","post","type-post","status-publish","format-standard","hentry","category-creative","category-global_warming","category-politics","category-us"],"yoast_head":"\nAn Inconvenient Truth: Ice Ages and Global Warming<\/title>\n<meta name=\"description\" content=\"I haven't seen Al Gore's movie "An Inconvenient Truth", although it is high on my agenda to see. Here is a blog post on this movie on "Blog or Die". The author brings out an interesting point based on the chart of the Ice-Ages and the level of Oxygen\/CO2. The movie presents many facts and draws conclusions. I want to separate out what is fact from what I have questions about. Fact List: Carbon dioxide is a greenhouse gas. That means that CO2 tends to allow light through, but not heat. That's a little like when you leave your car windows up on a sunny day. The light streams in through the windows, but the heat doesn't radiate out through glass as well. There is twice as much CO2 in the atmosphere than there has been at any time in the last 600,000 years. We know this because there are ice core samples taken in the Antarctic. Ice is deposited in recognizable annual layers, and schentists can measure the CO2 in the various layers. There is a strong correlation between the amount of CO2 in the atmosphere and the global temperature. The global temperature can be inferred through the ratio of two isotopes of Oxygen in the ice cores. 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