If you mean in human history, AFAIK there hasn't been a global raise of 1°C/century in historical times. Before that, I'm not sure that even ice age recovery rates can match that.<br><br>Alfio<br><br><br><div class="gmail_quote">
2010/3/3 Dan <span dir="ltr"><<a href="mailto:dan_ust@yahoo.com" target="_blank">dan_ust@yahoo.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><div style="font-family: verdana,helvetica,sans-serif; font-size: 12pt;"><div>While true on the _known_ rise in CO2 levels, it's not true in terms of climate change in historical times, no?</div>
<div> </div>
<div>Regards,</div>
<div> </div>
<div>Dan<br></div>
<div style="font-size: 12pt; font-family: verdana,helvetica,sans-serif;">
<div style="font-size: 12pt; font-family: times new roman,new york,times,serif;"><font face="Tahoma" size="2"><b><span style="font-weight: bold;">From:</span></b> Alfio Puglisi <<a href="mailto:alfio.puglisi@gmail.com" target="_blank">alfio.puglisi@gmail.com</a>><div>
<br><b><span style="font-weight: bold;">To:</span></b> ExI chat list <<a href="mailto:extropy-chat@lists.extropy.org" target="_blank">extropy-chat@lists.extropy.org</a>><br></div><b><span style="font-weight: bold;">Sent:</span></b> Wed, March 3, 2010 11:56:20 AM<div>
<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [ExI] Phil Jones acknowledging that climate science isn'tsettled<br></div></font>
<div class="gmail_quote"> </div><div><div></div><div>
<div class="gmail_quote">On Wed, Mar 3, 2010 at 5:24 PM, Stefano Vaj <span dir="ltr"><<a href="mailto:stefano.vaj@gmail.com" rel="nofollow" target="_blank">stefano.vaj@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">2010/3/2 Christopher Luebcke <<a href="mailto:cluebcke@yahoo.com" rel="nofollow" target="_blank">cluebcke@yahoo.com</a>>:<br>
<div>> But significant disruptions to ecosystems tend to cause a lot of suffering.<br>> That's where my concern lies.<br><br></div>Disruption as in...? Reduction in the aggregate mass of living<br>organisms? Reduction of complexity? Rapid change? Mass extinction of<br>
some species?<br><br>Any "historical" global warming-related examples of such disruptions?<br></blockquote>
<div><br>In human history, no, because the current CO2 levels are unprecedented in the last dozen million years or so.<br><br>In more ancient times, the PETM event ( <a href="http://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum" target="_blank">http://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum</a> ) might be a good example. It was a period of "sudden" global warming (6 °C over 20,000 years) associated with major changes in marine and terrestrial life.<br>
<br>Alfio</div></div></div></div></div></div></div><br>
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