Climate of the Carboniferous Period


	Climate of the Carboniferous Period

Rustee

7-6-2008 12:11 PM

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tags:

global warming, climate change

Rustee says:

Earth's atmosphere today contains about 380 ppm CO2 (0.038%). Compared to former geologic times, our present atmosphere, like the Late Carboniferous atmosphere, is CO2- impoverished!

Understanding Earth's geologic and climate past is important for understanding why our present Earth is the way it is, and what Earth may look like in the future.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/1a319310-8ee7-434d-8f35-4bcb7bec2f55/C4CC8009-0EDA-4D00-B469-9C5CAF041D79/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.geocraft.com/WVFossils/Carboniferous_climate.html" href="http://www.geocraft.com/WVFossils/Carboniferous_climate.html" style="font-size: 11px;">www.geocraft.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.geocraft.com/WVFossils/Carboniferous_climate.html"><P><B><FONT size="+3" color="#942b11">A</FONT></B>verage global temperatures
  in the <B>Early</B> <B>Carboniferous Period </B>were<B> hot</B>- approximately
  <B>20° C (68° F)</B>. However, cooling during the Middle Carboniferous
  reduced average global temperatures to about <B>12° C (54° F)</B>.
  As shown on the chart below, this is comparable to the average global temperature
  on Earth today!</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.geocraft.com/WVFossils/Carboniferous_climate.html"><P>Similarly, atmospheric concentrations of <B>carbon dioxide</B> (CO2)
  in the <B>Early Carboniferous Period</B> were approximately <B>1500 ppm</B>
  (parts per million), but by the <B>Middle Carboniferous</B> had declined
  to about <B>350 ppm</B> -- comparable to average CO2 concentrations today!</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.geocraft.com/WVFossils/Carboniferous_climate.html"> In the last 600 million years of Earth's history
  only the <B>Carboniferous Period </B>and our present age, the <B>Quaternary
  Period, </B>have witnessed CO2 levels less than <B>400 ppm</B>.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.geocraft.com/WVFossils/Carboniferous_climate.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.geocraft.com/img/D246FCA7-D30D-4A93-B67D-83FFB4413131" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.geocraft.com/WVFossils/Carboniferous_climate.html">
  To the consternation of global warming proponents, the Late Ordovician
  Period was also an <B>Ice Age </B>while at the same time CO2 concentrations
  then were nearly 12 times higher than today-- <B>4400 ppm</B>. </blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/C4CC8009-0EDA-4D00-B469-9C5CAF041D79/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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