}: Check date values in: |date= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)Hirsch, Tim (2006-01-11). "Plants revealed as methane source". BBC. {{cite news}}: Check date values in: |date= (help)Hoyt, Douglas V. (1993–11). "A discussion of plausible solar irradiance variations, 1700–1992". Journal of Geophysical Research. 98 (A11): 18, 895–18, 906. doi:10.1029/93JA01944. {{cite journal}}: Check date values in: |year= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)A. V. Karnaukhov (2001). "Role of the Biosphere in the Formation of the Earth's Climate: The Greenhouse Catastrophe" (PDF). Biophysics. 46 (6).Kenneth, James P. (2003-02-14). Methane Hydrates in Quaternary Climate Change: The Clathrate Gun Hypothesis. American Geophysical Union. 2011-06-06 දින මුල් පිටපත වෙතින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය 2009-04-11. {{cite book}}: Check date values in: |year= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)K