he 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 (5762): 838–840. doi:10.1126/science.1121235. PMID 16469923. {{cite journal}}: Check date values in: |date= (help)Svensmark, Henrik (2007-02-08). "Experimental evidence for the role of ions in particle nucleation under atmospheric conditions". Proceedings of the Royal Society A. FirstCite Early Online Publishing. 463 (2078): 385–396. doi:10.1098/rspa.2006.1773. 