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<div class="textMedBlackBold">By Sara Goudarzi</div><img hspace="0" src="http://msnbcmedia1.msn.com/j/msnbc/Components/Sources/Art/sourceLiveScience.gif,standard.jpg" border="0">
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<div id="udtD">Updated: 2:42 p.m. PT Dec 11, 2006</div><span></span></div></div>
<p class="textBodyBlack"><span id="byLine"></span>If you're looking to photograph a polar bear hopping sea ice floes on your next <a href="http://www.livescience.com/environment/050823_ice_free.html" target="_blank">summer
</a> cruise, you better hurry because in 30 years, the Arctic Sea could be free of ice. </p>
<div class="textBodyBlack"><span id="byLine"></span>Simulating the climate with computer models, researchers analyzed how global warming could affect sea ice in the future. The results, published in the Dec. 12 issue of
<em>Geophysical Research Letters,</em> indicate that if <a href="http://www.livescience.com/environment/ap_060315_carbon_dioxide.html" target="_blank">greenhouse gases</a> continue being released at their current rate, most of the Arctic basin will be ice free in September by 2040.
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<div class="textBodyBlack"><a href="http://www.msnbc.msn.com/id/16158893/">http://www.msnbc.msn.com/id/16158893/</a></div>
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<div class="textBodyBlack">Vision2020 Post: Ted Moffett</div>