(function() { var a=window;function b(){this.t={};this.tick=function(e,f){this.t[e]=[(new Date).getTime(),f]};this.tick("start")}var c=new b;a.jstiming={Timer:b,load:c};if(a.external&&a.external.pageT)a.jstiming.pt=a.external.pageT;var d=false;function g(){if(!d){d=true;a.jstiming.load.tick("firstScrollTime")}}a.addEventListener?a.addEventListener("scroll",g,false):a.attachEvent("onscroll",g); })();Science In Action #navbar-iframe { display:block }_qacct="p-e7bNTPBvNv4i6";quantserve(); function setAttributeOnload(object, attribute, val) { if(window.addEventListener) { window.addEventListener("load", function(){ object[attribute] = val; }, false); } else { window.attachEvent('onload', function(){ object[attribute] = val; }); } } Science In ActionExplore real-word math and science here! ↑ Grab this Headline Animator Do Cow Farts Cause Global Warming?Bovine Flatulence--Threat or Menace? Cows can digest things we can't, especially including the cellulose in grass and grain. They do this by maintaining cultures of microorganisms in their complicated series of "stomachs" that can break down cellulose. The cows then digest the microbes and the sugars and fatty acids they produce.(Brief overview of ruminant digestion here. If you are interested in delving into the digestive physiology of ruminants in more detail, start here.)Some of these microbes produce methane (CH4). Some of the other microbes can use that methane as food, but a certain amount of it escapes as belches or farts (mostly belches). (Some people have microbes in their guts which produce methane, and thus their farts also contain methane--but nothing compared to the amount cows produce.)The publication Emissions of Greenhouse Gases in the United States 2006 (pdf) summarizes the total greenhouse gas output of the US: Of the 605 million metric tonnes CO2 equivalent of methane shown in the graph, about 115 million tonnes CO2e is from "livestock enteric fermentation"--mostly cow burps and farts. That is less than 20% of the methane load, and less than 2% of the 7 billion tonne CO2e total.Of course raising cattle causes other greenhouse gas emissions.There are about 56 million tonnes CO2e of methane and 55 million tonnes CO2e of nitrogen oxides released from cattle wastes as they decompose. (Some of that methane can be captured and used to generate electricity or heat, while releasing carbon dioxide, a much less potent greenhouse gas.)About 227 million tonnes CO2e of nitrous oxide is released from nitrogen fertilization of soils (30% of it from nitrogen fixed by the crops themselves, not from industrially produced fertilizers). Most of the nitrogen fertilizer used on crops (89%) is used on corn (maize). About half of the corn produced in the US is fed to livestock, a large fraction to cattle, especially dairy cows. So about 50 million tonnes CO2e emissions associated with fertilizer use should be indirectly blamed on cows.(Another large fraction of corn is used to make ethanol as a motor fuel, indirectly causing the release of significant amounts of greenhouse gases in the corn production. But that's another story.)So cattle are responsible for about 3.5% of US greenhouse gas emissions, on a CO2 equivalent basis. To keep this in perspective:2% of greenhouse gas production is in the form of methane from garbage decomposing in landfills.Roughly 2% is chlorofluorocarbons (CFCs) from air conditioners, refrigerators and industrial processes.Other industrial processes (especially cement manufacture) produce about 2%.Burning jet fuel accounts for more than 3%.12% of greenhouse gas emissions are CO2 emitted generating electricity which is used in residential applications like lighting, TVs, computers, and refrigerators.17% came from burning gasoline in cars and trucks.So cow farts and burps do contribute some to greenhouse gases, and thus to global climate change. But they are not a major cause. Nonetheless, improvements in fertilizer use and waste management in agriculture could reduce the cow-related burden on our atmosphere.Reduced consumption of beef and dairy products would probably have little effect. (If half of US consumers cut their consumption of beef and dairy products in half -- and the resulting drop in prices didn't stimulate the other half to increase their consumption, or drive more exports -- it would reduce national greenhouse gas emissions by about 1%.) Maybe this will become more of an issue in the future.David Wheat's Science In Action site has articles about science and math in the real world, weird science, science news, unexpected connections, and other cool science stuff. There is an index of the articles by topic here.tags: global warming, climate change, carbon choices, greenhouse gas emissions, co2, methane, cattle, cows, farts, agriculturePosted byD. Wheatat20:432commentsLinks to this post Older PostsSubscribe to:Posts (Atom) Subscribe in a readerEnter your search terms WebScience In ActionSubmit search form Find Other Articles:Browse Science In Action Posts Indexed By Topic here Why I Write This Blog:If you want to know, read this post.   Check Out HaraBara  Green Youth Go Lite  Blogs & Links of Interest var sc_project=1007968; var sc_invisible=1; var sc_partition=9; var sc_security="c8d7f0c0"; _uacct = "UA-1304533-2";urchinTracker(); Blog Archive:Blog Archive:January 2008 (1)December 2007 (1)November 2007 (1)August 2007 (2)July 2007 (1)March 2007 (2)August 2006 (1)July 2006 (1)June 2006 (1)April 2006 (1)December 2005 (1)November 2005 (6)October 2005 (4)September 2005 (5)August 2005 (7)July 2005 (1)June 2005 (2)May 2005 (1)April 2005 (1)March 2005 (3)February 2005 (1)January 2005 (1)December 2004 (6)November 2004 (14)October 2004 (4) About Me:D. WheatPh.D. in biology + career in business + concern about global climate change + expertise in cleantech + interest in science + desire to share some of the exciting things science teaches us. 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cond\75\47data:interval.expclass \75\75 \46quot;expanded\46quot;\47\76\n\74a class\75\47toggle\47 expr:href\75\47data:widget.actionUrl + \46quot;\46amp;action\75toggle\46quot; + \46quot;\46amp;dir\75close\46amp;toggle\75\46quot; + data:interval.toggleId + \46quot;\46amp;toggleopen\75\46quot; + data:toggleopen\47\76\n\74span class\75\47zippy toggle-open\47\76\46#9660; \74/span\76\n\74/a\76\n\74b:else\76\74/b:else\76\n\74a class\75\47toggle\47 expr:href\75\47data:widget.actionUrl + \46quot;\46amp;action\75toggle\46quot; + \46quot;\46amp;dir\75open\46amp;toggle\75\46quot; + data:interval.toggleId + \46quot;\46amp;toggleopen\75\46quot; + data:toggleopen\47\76\n\74span class\75\47zippy\47\76\n\74b:if cond\75\47data:blog.languageDirection \75\75 \46quot;rtl\46quot;\47\76\n \46#9668;\n \74b:else\76\74/b:else\76\n \46#9658;\n \74/b:if\76\n\74/span\76\n\74/a\76\n\74/b:if\76\n\74/b:if\076'}, 'posts': {'varName': 'posts', 'template': '\74ul class\75\47posts\47\76\n\74b:loop values\75\47data:posts\47 var\75\47i\47\76\n\74li\76\74a expr:href\75\47data:i.url\47\76\74data:i.title\76\74/data:i.title\76\74/a\76\74/li\76\n\74/b:loop\76\n\74/ul\076'}}, document.getElementById('BlogArchive1'), {'languageDirection': 'ltr'}, 'displayModeFull'));_WidgetManager._RegisterWidget('_ProfileView', new _WidgetInfo('Profile1', 'sidebar',{'main': {'varName': '', 'template': '\74b:if cond\75\47data:title !\75 \46quot;\46quot;\47\76\n\74h2\76\74data:title\76\74/data:title\76\74/h2\76\n\74/b:if\76\n\74div class\75\47widget-content\47\76\n\74b:if cond\75\47data:team \75\75 \46quot;true\46quot;\47\76\n\74ul\76\n\74b:loop values\75\47data:authors\47 var\75\47i\47\76\n\74li\76\74a expr:href\75\47data:i.userUrl\47\76\74data:i.display-name\76\74/data:i.display-name\76\74/a\76\74/li\76\n\74/b:loop\76\n\74/ul\76\n\74b:else\76\74/b:else\76\n\74b:if cond\75\47data:photo.url !\75 \46quot;\46quot;\47\76\n\74a expr:href\75\47data:userUrl\47\76\74img class\75\47profile-img\47 expr:alt\75\47data:photo.alt\47 expr:height\75\47data:photo.height\47 expr:src\75\47data:photo.url\47 expr:width\75\47data:photo.width\47/\76\74/a\76\n\74/b:if\76\n\74dl class\75\47profile-datablock\47\76\n\74dt class\75\47profile-data\47\76\74data:displayname\76\74/data:displayname\76\74/dt\76\n\74b:if cond\75\47data:showlocation \75\75 \46quot;true\46quot;\47\76\n\74dd class\75\47profile-data\47\76\74data:location\76\74/data:location\76\74/dd\76\n\74/b:if\76\n\74b:if cond\75\47data:aboutme !\75 \46quot;\46quot;\47\76\74dd class\75\47profile-textblock\47\76\74data:aboutme\76\74/data:aboutme\76\74/dd\76\74/b:if\76\n\74/dl\76\n\74a class\75\47profile-link\47 expr:href\75\47data:userUrl\47\76\74data:viewProfileMsg\76\74/data:viewProfileMsg\76\74/a\76\n\74/b:if\76\n\74b:include name\75\47quickedit\47\76\74/b:include\76\n\74/div\076'}}, document.getElementById('Profile1'), {}, 'displayModeFull'));_WidgetManager._RegisterWidget('_HeaderView', new _WidgetInfo('Header1', 'header'));_WidgetManager._RegisterWidget('_NavbarView', new _WidgetInfo('Navbar1', 'navbar'));_WidgetManager._RegisterWidget('_BlogView', new _WidgetInfo('Blog1', 'main')); |
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