The previously increasing atmospheric methane concentration has inexplicably stalled over the past three decades. This may be due to a fall in fossil-fuel emissions or to farming practices that are curtailing microbial sources.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/enigma-recent-methane-budget
[2] http://admin.indiaenvironmentportal.org.in/category/author/martin-heimann
[3] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/methane
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/land-use
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biomass-gasification
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forest-fires
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change