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Line 1: − 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>. +
Methane is one of the "greenhouse gases".
'''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.
'''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.
Methane is one of the "[[greenhouse gas]]es".
==References==
==References==