Climate change and trace gases Hansen, James ; Sato, Makiko ; Kharecha, Pushker ; Russell, Gary ; Lea, David W. ; Siddall, Mark Abstract Publication: Philosophical Transactions of the Royal Society of London Series A Pub Date: July 2007 DOI: 10.1098/rsta.2007.2052 Bibcode: 2007RSPTA.365.1925H