Gale, Joseph. [Metà atmosfèric a Google BooksAstrobiology of Earth : the emergence, evolution, and future of life on a planet in turmoil] (en anglès). Oxford: Oxford University Press, 2009. ISBN 978-0-19-920580-6.
Houghton. [Metà atmosfèric a Google BooksClimate change 2001 : the scientific basis : contribution of Working Group I to the third assessment report of the Intergovernmental Panel on Climate Change] (en anglès). Cambridge: Cambridge University Press, 2001. ISBN 978-0521807678. OCLC46634335.
Dlugokencky, Ed. «Trends in Atmospheric Methane» (en anglès). Global Greenhouse Gas Reference Network. NOAA Earth System Research Laboratory, 05-12-2016. [Consulta: 22 desembre 2016].
[1] GMAO Chemical Forecasts and GEOS–CHEM NRT Simulations for ICARTT (top) and Randy Kawa, NASA GSFC Atmospheric Chemistry and Dynamics Branch (lower).
Houghton. [Metà atmosfèric a Google BooksClimate change 2001 : the scientific basis : contribution of Working Group I to the third assessment report of the Intergovernmental Panel on Climate Change] (en anglès). Cambridge: Cambridge University Press, 2001. ISBN 978-0521807678. OCLC46634335.