ින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය 2009-04-11. {{cite book}}: Check date values in: |date= (help)Ruddiman, William F. (2005-08-01). Plows, Plagues, and Petroleum: How Humans Took Control of Climate. New Jersey: Princeton University Press. ISBN 0-691-12164-8. {{cite book}}: Check date values in: |date= (help)Solanki, Sami K. (2004-10-23). "Unusual activity of the Sun during recent decades compared to the previous 11,000 years" (PDF). Nature. 431: 1084–1087. doi:10.1038/nature02995. {{cite journal}}: Check date values in: |date= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)Solanki, Sami K. (2005-07-28). "Climate: How unusual is today's solar activity? (Reply)" (PDF). Nature. 436: E4–E5. doi:10.1038/nature04046. {{cite journal}}: Check date values in: |date= (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)Sowers, Todd (2006-02-10). "Late Quaternary Atmospheric CH4 Isotope Record Suggests Marine Clathrates Are Stable". Science. 311 (5