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<DIV id=slugline><CITE><ABBR class=slug-jnl-abbrev
title=Science>Science</ABBR><SPAN class=slug-pub-date itemprop="datePublished">
8 March 2013: </SPAN><BR><SPAN class=slug-vol>Vol. 339 </SPAN><SPAN
class=slug-issue>no. 6124 </SPAN><SPAN class=slug-pages>pp. 1198-1201
</SPAN><BR>DOI: <SPAN class=slug-doi
title=10.1126/science.1228026>10.1126/science.1228026 </SPAN></CITE></DIV>
<DIV class="article abstract-view " itemprop="articleBody"><SPAN
class=highwire-journal-article-marker-start></SPAN> </DIV>
<DIV id=article-title-1 itemprop="headline"><FONT size=4>A Reconstruction of
Regional and Global Temperature for the Past 11,300 Years</FONT></DIV>
<DIV class="article abstract-view " itemprop="articleBody">
<DIV id=contrib-1 class=contributor itemscope="itemscope"
itemtype="http://schema.org/Person" itemprop="author"><SPAN class=name
itemprop="name"><A class=name-search
href="http://www.sciencemag.org/search?author1=Shaun+A.+Marcott&sortspec=date&submit=Submit">Shaun
A. Marcott</A></SPAN><A id=xref-aff-1-1 class=xref-aff
href="http://www.sciencemag.org/content/339/6124/1198.abstract#aff-1"><SUP>1</SUP></A>,
<SPAN class=name itemprop="name"><A class=name-search
href="http://www.sciencemag.org/search?author1=Jeremy+D.+Shakun&sortspec=date&submit=Submit">Jeremy
D. Shakun</A></SPAN><A id=xref-aff-2-1 class=xref-aff
href="http://www.sciencemag.org/content/339/6124/1198.abstract#aff-2"><SUP>2</SUP></A>,
<SPAN class=name itemprop="name"><A class=name-search
href="http://www.sciencemag.org/search?author1=Peter+U.+Clark&sortspec=date&submit=Submit">Peter
U. Clark</A></SPAN><A id=xref-aff-1-2 class=xref-aff
href="http://www.sciencemag.org/content/339/6124/1198.abstract#aff-1"><SUP>1</SUP></A>,
<SPAN class=name><A class=name-search
href="http://www.sciencemag.org/search?author1=Alan+C.+Mix&sortspec=date&submit=Submit">Alan
C. Mix</A></SPAN><A id=xref-aff-1-3 class=xref-aff
href="http://www.sciencemag.org/content/339/6124/1198.abstract#aff-1"><SUP>1</SUP></A><SUP></SUP></DIV>
<DIV class=contributor itemscope="itemscope" itemtype="http://schema.org/Person"
itemprop="author"><SUP>1</SUP>College of Earth, Ocean, and Atmospheric Sciences,
Oregon State University, Corvallis, OR 97331, USA. <SUP>2</SUP>Department of
Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138,
USA. E-mail: <SPAN class=em-link><SPAN class=em-addr><A
href="mailto:marcotts@science.oregonstate.edu">marcotts@science.oregonstate.edu</A></SPAN></SPAN></DIV>
<DIV id=abstract-1 class="section editor-summary" itemprop="description">
<H2><FONT size=2>Exceptional Now</FONT></H2>
<P id=p-1>The climate has been warming since the industrial revolution, but how
warm is climate now compared with the rest of the Holocene? <STRONG>Marcott
<EM>et al.</EM></STRONG> (p. <A
href="http://www.sciencemag.org/lookup/doi/10.1126/science.1228026">1198</A>)
constructed a record of global mean surface temperature for more than the last
11,000 years, using a variety of land- and marine-based proxy data from all
around the world. The pattern of temperatures shows a rise as the world emerged
from the last deglaciation, warm conditions until the middle of the Holocene,
and a cooling trend over the next 5000 years that culminated around 200 years
ago in the Little Ice Age. Temperatures have risen steadily since then, leaving
us now with a global temperature higher than those during 90% of the entire
Holocene. </P></DIV>
<DIV id=abstract-3 class="section abstract">
<H2><FONT size=2>Abstract</FONT></H2>
<P id=p-3>Surface temperature reconstructions of the past 1500 years suggest
that recent warming is unprecedented in that time. Here we provide a broader
perspective by reconstructing regional and global temperature anomalies for the
past 11,300 years from 73 globally distributed records. Early Holocene (10,000
to 5000 years ago) warmth is followed by ~0.7°C cooling through the middle to
late Holocene (<5000 years ago), culminating in the coolest temperatures of
the Holocene during the Little Ice Age, about 200 years ago. This cooling is
largely associated with ~2°C change in the North Atlantic. Current global
temperatures of the past decade have not yet exceeded peak interglacial values
but are warmer than during ~75% of the Holocene temperature history.
Intergovernmental Panel on Climate Change model projections for 2100 exceed the
full distribution of Holocene temperature under all plausible greenhouse gas
emission scenarios. </P>
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