Methane emission by sectors: A comprehensive review of emission sources and mitigation methods

Yusuf, Rafiu Olasunkanmi; Noor, Zainura Zainon; Abba, Ahmad Halilu; Hassan, Mohd Ariffin Abu; Din, Mohd Fadhil Mohd

doi:10.1016/j.rser.2012.04.008

Cited by 180 publications

(105 citation statements)

References 111 publications

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“…Almost a third (28%) of anthropogenic CH 4 emissions are due to enteric fermentation in livestock (Yusufa et al 2012), an impact predicted to rise further due to an increased worldwide demand for meat, milk, and other animal products. The dominant source of CH 4 emissions from livestock is from ruminants (Naqv 2011), where CH 4 is formed as a byproduct of feed fermentation in the forestomach (rumen) by CH 4 -producing archaea, known as methanogens (Boone et al 1993).…”

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confidence: 99%

Methane yield phenotypes linked to differential gene expression in the sheep rumen microbiome

et al. 2014

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Ruminant livestock represent the single largest anthropogenic source of the potent greenhouse gas methane, which is generated by methanogenic archaea residing in ruminant digestive tracts. While differences between individual animals of the same breed in the amount of methane produced have been observed, the basis for this variation remains to be elucidated. To explore the mechanistic basis of this methane production, we measured methane yields from 22 sheep, which revealed that methane yields are a reproducible, quantitative trait. Deep metagenomic and metatranscriptomic sequencing demonstrated a similar abundance of methanogens and methanogenesis pathway genes in high and low methane emitters. However, transcription of methanogenesis pathway genes was substantially increased in sheep with high methane yields. These results identify a discrete set of rumen methanogens whose methanogenesis pathway transcription profiles correlate with methane yields and provide new targets for CH 4 mitigation at the levels of microbiota composition and transcriptional regulation.

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Methane yield phenotypes linked to differential gene expression in the sheep rumen microbiome

et al. 2014

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“…ethane is the second most significant anthropogenic greenhouse gas, after carbon dioxide, and its concentration in the atmosphere is increasing (1). One major contributor to this is an intensification and expansion of global agricultural activities, in particular increased ruminant livestock numbers.…”

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Few Highly Abundant Operational Taxonomic Units Dominate within Rumen Methanogenic Archaeal Species in New Zealand Sheep and Cattle

Seedorf

Kittelmann

Janssen

2015

Appl Environ Microbiol

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Sequencing and analyses of 16S rRNA gene amplicons were performed to estimate the composition of the rumen methanogen community in 252 samples from eight cohorts of sheep and cattle, separated into 16 different sample groups by diet, and to determine which methanogens are most prominent in the rumens of farmed New Zealand ruminants. Methanobacteriales (relative abundance ؎ standard deviation, 89.6% ؎ 9.8%) and Methanomassiliicoccales (10.4% ؎ 9.8%) were the two major orders and contributed 99.98% (؎0.1%) to the rumen methanogen communities in the samples. Sequences from Methanobacteriales were almost entirely from only four different species (or clades of very closely related species). Each was detectable in at least 89% of the samples. These four species or clades were the Methanobrevibacter gottschalkii clade and Methanobrevibacter ruminantium clade with a mean abundance of 42.4% (؎19.5% standard deviation) and 32.9% (؎18.8%), respectively, and Methanosphaera sp. ISO3-F5 (8.2% ؎ 6.7%) and Methanosphaera sp. group5 (5.6% ؎ 5.7%). These four species or clades appeared to be primarily represented by only one or, in one case, two dominant sequence types per species or clade when the sequences were grouped into operational taxonomic units (OTUs) at 99% sequence identity. The mean relative abundance of Methanomassiliicoccales in the samples was relatively low but exceeded 40% in some of the treatment groups. Animal feed affected the apparent methanogen community structure of both orders, as evident from differences in relative abundances of the major OTUs in animals under different feeding regimens.M ethane is the second most significant anthropogenic greenhouse gas, after carbon dioxide, and its concentration in the atmosphere is increasing (1). One major contributor to this is an intensification and expansion of global agricultural activities, in particular increased ruminant livestock numbers. Ruminants, such as cattle, sheep, and domesticated deer, produce large amounts of methane via enteric fermentation and are the most numerous farm animals in New Zealand. It is estimated that methane from these animals accounts for almost 30% of New Zealand's total anthropogenic greenhouse gas emissions (2).Methane is produced in the rumen by methanogenic archaea, here referred to as methanogens. Methanogens comprise a phylogenetically diverse group of microorganisms that are present in the rumen at up to ϳ10 10 cells/g rumen contents (3). Previous analyses have shown that members of the orders Methanobacteriales and Methanomassiliicoccales are dominant in the rumens of domesticated ruminants in New Zealand and many other geographic locations around the world (4). The order name Methanomassiliicoccales has only recently been proposed (5). These methanogens are closely related to the Thermoplasmatales (6) and were previously known as rice cluster III (RC-III) archaea (7), rumen cluster C (RCC) (4), or Methanoplasmatales (8). Within the order Methanobacteriales, hydrogenotrophic methanogens of the genus Methanobrevibacter appe...

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“…It is estimated that the emission after 2009 will continue to increase as the amount of cattle determines the amount of manure produced, thus affecting the emission. According to [10], the amount of methane released is related to the composition of manure. The more the amount of cattle, the higher the amount of methane generated due to increased manure produced.…”

Section: Ch 4manure =∑[(Ef·n)/(10^6)]mentioning

confidence: 99%

Methane emissions from paddy cultivation and livestock farming in Sarawak, Malaysia

2017

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Methane emission by sectors: A comprehensive review of emission sources and mitigation methods

Cited by 180 publications

References 111 publications

Methane yield phenotypes linked to differential gene expression in the sheep rumen microbiome

Methane yield phenotypes linked to differential gene expression in the sheep rumen microbiome

Few Highly Abundant Operational Taxonomic Units Dominate within Rumen Methanogenic Archaeal Species in New Zealand Sheep and Cattle

Methane emissions from paddy cultivation and livestock farming in Sarawak, Malaysia

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