Greenhouse gases (unspecified)	“The original version of the film claimed 51% of global greenhouse gases were produced by animal agriculture, based on a single, non-peer-reviewed academic paper – the scientific consensus is closer to 15%”. (The Guardian, May 2, 2018)
Methane gas	“Methane is among the most potent greenhouse gases, and researchers now believe livestock industries are a major contributor to climate change, responsible for more greenhouse-gas emissions than cars are, according to the United Nations”. (Wall Street Journal, February 26, 2009)
Carbon Dioxide	“In a paper published last month in the American Journal of Clinical Nutrition, food ecologist Annika Carlsson-Kanyama showed that kilo for kilo, beef and pork could produce 30 times more CO2 emissions than other protein rich foods such as beans”. (The Guardian, May 16, 2009)
Growing feed crops (for animals)	“United Nations figures suggest that meat production is responsible for about 18% of global carbon emissions, including the destruction of forest land for cattle ranching and the production of animal feeds”. (The Telegraph, October 27, 2009)
Growing demand for meat	“But the really serious issue is the intensive farming of livestock, particularly cows and sheep, which generate as much as a half of the total emissions. […] And, worldwide, the gradual increase in the consumption of meat creates pressure to cut down forests to create new pastureland and cropland for grains to help feed the livestock”. (The Guardian, October 27, 2009)
Use of fertilizers	“Methane is produced by the digestive processes of livestock, while nitrous oxide is released by many agricultural fertilisers. Scientists say both contribute to global warming, along with carbon dioxide (CO2)”. (The Telegraph, July 8, 2008)
Deforestation	“Deforestation to make way for livestock, along with methane emissions from cows and fertilizer use, creates as much greenhouse gas emissions as all the world’s cars, trucks and airplanes”. (The Guardian, December 21, 2018)