Climate Change: Positive Feedbacks


	Climate Change: Positive Feedbacks

kmcolo

11-18-2007 4:46 PM

397 views

tags:

climate change, global warming, science

kmcolo says:

Don't equate positive feedbacks with positive things. Things (for now - cross fingers) are worse than was envisioned.

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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://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/60ef1446-6c16-40da-8ce3-5bce42e97b28/48ADB62A-F157-47FF-A3F8-18640DFBFBC0/" 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.skepticalscience.com/news.php?n=18" href="http://www.skepticalscience.com/news.php?n=18" style="font-size: 11px;">www.skepticalscience.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.skepticalscience.com/news.php?n=18"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.skepticalscience.com/img/3DB20CAB-1B54-4BBF-9883-23B7F5867E9B" 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.skepticalscience.com/news.php?n=18">Arctic sea ice loss has not only has exceeded IPCC model projections - it has fallen below even the extreme lower limit of predictions (<A href="http://www.cosis.net/abstracts/EGU2007/01362/EGU2007-J-01362.pdf" >Stroeve 2007</A>)</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.skepticalscience.com/news.php?n=18"><P> As Douglas Bancroft, Director of the Canadian Ice Service, <A  href="http://www.sciencedaily.com/releases/2007/10/071026095001.htm">puts it</A>: "The overall extent was similar to what some of the models envisioned but decades in advance of when they expected that would occur. In fact, the summer of 2007 looked very similar to some climate model forecasts for 2030 to 2050."</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.skepticalscience.com/news.php?n=18"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.skepticalscience.com/img/22D103A0-7EAC-427D-A895-5EB2C6677467" 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.skepticalscience.com/news.php?n=18">The IPCC projected a range of scenarios with the worst case scenarios based on a 1.3%/year increase in GHG emissions. Actual CO2 levels have been rising at 3.3%/year since 2000 (<A href="http://www.pnas.org/cgi/content/abstract/0702737104v1?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=%22field%22+%2B+%22Canadell%22&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT" >Canadell 2007</A>). The figure below shows observed CO2 emissions (black lines and the red dots) have already exceeded the worst case scenario (red line A1F1) projected by the IPCC (<A href="http://www.pnas.org/cgi/reprint/0700609104v1.pdf" >Raupach 2007</A>).</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/48ADB62A-F157-47FF-A3F8-18640DFBFBC0/blog/" title="blog or email this clip"><img src="http://content8.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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