100,000 years - for Anthropocene CO2 reversal by natural processes. The Paleocene-Eocene Thermal Maximum took 100,000 years to remove the CO2 from the atmosphe

100,000 years - for Anthropocene CO2 reversal by natural processes. The Paleocene-Eocene Thermal Maximum took 100,000 years to remove the CO2 from the atmosphere naturally.[1] The current situation is directly comparable. Humans have input 1000 Gigatons of CO2 to date and ~1000 Gigaton more by centuries end. Roughly PETM CO2 estimates [1]. The big PETM change came when the Methane Clathydrates at the bottom of the sea started melting. [1] http://www.bbc.co.uk/programmes/b08hpmmf http://www.bbc.co.uk/programmes/b08hpmmf : 35:42 In our time: The Paleocene-Eocene Thermal Maximum, Melvyn Bragg & Guests.