| − | '''Methane''' is a [[chemical]] substance CH<sub>4</sub> found in a high percentage in [[natural gas]]. It is also a common byproduct of digestion in animals. | + | '''Methane''' is a [[chemical]] substance CH<sub>4</sub> found in a high percentage in [[natural gas]]. It is also a common byproduct of [[digestion]] in [[animal]]s. |
| − | According to the [[United Nations]] Food and Agriculture Organization, [[scientists]] believe that methane emissions from the increasing numbers of cattle may contribute to [[climate change]].<ref>[http://www.fao.org/newsroom/en/news/2006/1000448/index.html Livestock a major threat to environment: Remedies urgently needed] </ref>. | + | According to the [[United Nations]] Food and Agriculture Organization, [[scientists]] believe that methane emissions from the increasing numbers of [[[cattle]] may contribute to [[climate change]].<ref>[http://www.fao.org/newsroom/en/news/2006/1000448/index.html Livestock a major threat to environment: Remedies urgently needed] </ref>. |