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Don't blame dairy cows for (greenhouse) gas emissions, new study shows

Date:
October 19, 2010
Source:
Michigan Technological University
Summary:
Forget all the tacky jokes about cow flatulence causing climate change. A new study reports that the dairy industry is responsible for only about 2.0 percent of all US greenhouse gas emissions.

A new study by the University of Arkansas and Michigan Tech shows that the dairy industry -- including this Jersey cow -- is responsible for only about 2 percent of all US greenhouse gas emissions.
Credit: Photo by Stephen Kennedy, courtesy of the Innovation Center for the US Dairy

Forget all the tacky jokes about cow flatulence causing climate change. A new study reports that the dairy industry is responsible for only about 2.0 percent of all US greenhouse gas emissions.

The study, led by the University of Arkansas in association with Michigan Technological University, measures the carbon footprint of a gallon of fluid milk from farm to table and uses 2007 and 2008 data from more than 500 dairy farms and 50 dairy processors, as well as data from more than 210,000 round trips transporting milk from farm to processing plant. It was commissioned by the Innovation Center for the US Dairy, an industry-wide group.

The University of Arkansas addressed carbon emissions from the dairy to the milk in your cereal bowl. The Michigan Tech group looked further upstream. "We focused on the carbon footprint of the feed crops," said chemical engineering professor David Shonnard, director of the Sustainable Futures Institute. "Animal feed is a major contributor to carbon emissions." Using US Department of Agriculture data, Shonnard's team, including PhD student Felix Adom and four undergraduates (Ashely Maes, Charles Workman, Zachary Bergmann and Lilian Talla), analyzed the impact of variables ranging from fertilizer and herbicides to harvesting and transportation. "We also looked at a Michigan feed mill, where grain gets combined with any of over a hundred different additives," he said.

The team concluded that the cumulative total emission of greenhouse gases associated with all fluid milk consumed in the US was approximately 35 million metric tons in 2007. While the emissions are lower than sometimes reported, there is still room for improvement for dairy farms and businesses of all kinds, the study concluded. In particular, manure management, feed production and enteric methane (cow gas) were cited as areas that are ripe for innovation on farms. Energy management provides the greatest opportunity in the processing, transportation and retail segments.

The project has also raised other dairy-related issues that Shonnard's group is investigating. They are studying the eutrophication of water -- what happens when nutrients such as manure and fertilizers get into surface water, causing an overbloom of algae that sucks oxygen from the water and kills fish. The team is also investigating water consumption and land use in the dairy industry. "Growing crops is becoming more productive all the time, and we may be able to use less land to satisfy demand," Shonnard said.


Story Source:

The above story is based on materials provided by Michigan Technological University. The original article was written by Marcia Goodrich. Note: Materials may be edited for content and length.


Cite This Page:

Michigan Technological University. "Don't blame dairy cows for (greenhouse) gas emissions, new study shows." ScienceDaily. ScienceDaily, 19 October 2010. <www.sciencedaily.com/releases/2010/10/101018163743.htm>.
Michigan Technological University. (2010, October 19). Don't blame dairy cows for (greenhouse) gas emissions, new study shows. ScienceDaily. Retrieved April 20, 2014 from www.sciencedaily.com/releases/2010/10/101018163743.htm
Michigan Technological University. "Don't blame dairy cows for (greenhouse) gas emissions, new study shows." ScienceDaily. www.sciencedaily.com/releases/2010/10/101018163743.htm (accessed April 20, 2014).

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