Michael Chabon in Henry Jenkins; Wyn Kelley; Katie Clinton (2013). Reading in a Participatory Culture: Remixing Moby-Dick in the English Classroom. Teachers College Press. p. 146. ISBN 978-0-8077-5401-6.
Current global observational and modelling capabilities allow scientists to produce estimates of the carbon budget, but many uncertainties remain. An EU-funded initiative was therefore established to provide more and better data on carbon dioxide (CO2) and methane (CH4) through a global carbon observation and analysis system.