Dual modes of the carbon cycle since the Last Glacial Maximum.
Smith H J, Fischer H, Wahlen M, +2 more·Nature
The most conspicuous feature of the record of past climate contained in polar ice is the rapid warming which occurs after long intervals of gradual cooling. During the last four transitions from glacial to interglacial conditions, over which such abrupt warmings occur, ice records indicate that the CO2 concentration of…