This paper discusses the method and results of a trend assessment of global CO2 emissions up to 2010 and updates the previous assessment of CO2 emissions up to and including 2009 (Olivier and Peters, 2010). This assessment includes not only fossil fuel combustion on which the BP reports are based, but also incorporates all other relevant CO2 emissions sources including flaring of waste gas during oil production, cement clinker production and other limestone uses, feedstock and other non-energy uses of fuels, and several other small sources.