On top of only being 18-19% from the source you linked as well as another I found, I keep not seeing specific numbers on cows, but more on livestock.    Also, not all cows that are livestock, and not all livestock itself , are being raised just to be eaten.     I want to believe.


You should check out this discussion between people on this topic, a good debate that I feel brings out excellent points about that types of gas livestock would have versus a vehicle http://message.snopes.com/showthread.php?t=77718  

I wish someone would just the update the image, because it is not like the information could not be presented in a way that is fun and informative but also be true.

This link you are providing does not list any 51%, but only "19% of the world’s greenhouse gas emissions"

Another source says 18% http://www.todayifoundout.com/index.php/2014/04/cow-farts-really-significantly-contribute-global-warming/

I dunno what you wanna prove or disprove here. From the links and points you made on the above comment thread :
>"Fossil fuel-based energy is responsible for about 80% of total greenhouse gas emissions as compared to about 6% from animal agriculture"

it looks like you are questioning the data about GHG emission by quoting some 15-20 years old report that is specific to US. Please also take into account the following reports:
 1. [World Watch Institute](http://www.worldwatch.org/files/pdf/Livestock%20and%20Climate%20Change.pdf)
 2. [Georgetown Environmental Law Review. October 23, 2015. (New)](https://gelr.org/2015/10/23/a-leading-cause-of-everything-one-industry-that-is-destroying-our-planet-and-our-ability-to-thrive-on-it-georgetown-environmental-law-review/)
 3. [Independent, 2009](http://www.independent.co.uk/environment/climate-change/study-claims-meat-creates-half-of-all-greenhouse-gases-1812909.html)

And mind that these reports were out after the further researches when United Nations report claimed that emissions from animal agriculture industry at 18% is far greater than all fossil fuel transport combined (only 13%):

[FAO Report - Livestock's Long Shadow, 2006](http://www.fao.org/newsroom/en/news/2006/1000448/index.html)

However [the latest FAO report](https://www.theguardian.com/global-development/2013/sep/26/greenhouse-gas-emissions-livestock) lowers that number a bit but it's still higher than the emissions by transportation industry. This is even when you consider the IPCC's new guidelines for calculating greenhouse gas production.

I'm not contradicting your data, you made a valid point about a single nation i.e. USA. The latest [EPA report](https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions) clearly states that the largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation. But this doesn't take into account the consumption of livestock through imports. It would be much better if you consider the global stats instead of looking at the stats of a single country.

There are even reports for projection which projects that by 2050 this emission will reach 80%. [Read more here](http://academic.regis.edu/MFRANCO/Seminar%20in%20Biology%20research%20Literature/Papers/GobalDiets.pdf) about it.
I'd like to add that by strongly contradicting such data, you are not helping any cause. Tell me, what cause it hurts even if data is slightly off (though it is not!)? You would also love to watch the documentary "Cowspiracy" which will make all data and controversies black & white for you. 

Thank you for taking time to research this data further!