<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/780a244b-4912-425c-89e4-7b12677a1223/98DFAB3A-55B0-4994-8CEF-49CEA17DD47D/" 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://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/" href="http://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/" style="font-size: 11px;">features.csmonitor.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/">Next time you’re in an airplane racing down the runway for takeoff, make a mental note of that moment when the plane leaves the ground. In a warmer world, that moment of liftoff will come later.</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://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/">Airplanes take off when the air passing over their wings creates enough lift — lift greater than the aircraft’s weight. That moment is determined by, among other things, the air’s density. Air is denser at sea level where there’s greater atmospheric pressure. It’s also denser in colder conditions; a cold molecule takes up less space than a warmer one.</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://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/">Somewhat counter-intuitively, humidity decreases air density as well. A water molecule occupies as much space as other molecules in the atmosphere</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://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/">Temperatures are rising</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://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/">Warmer air holds more humidity</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://features.csmonitor.com/environment/2009/09/10/a-warmer-world-could-make-current-airport-runways-too-short/">days of extreme highs have — and will likely continue to — become more frequent. All of which changes that moment when a plane speeding down the runway generates enough lift to take off.</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/98DFAB3A-55B0-4994-8CEF-49CEA17DD47D/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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