A History of Atmospheric CO2 and Its Effects on Plants, Animals, and Ecosystems - Baldwin, I.T; Caldwell, M.M; Heldmaier, G.; Jackson, Robert B.; Lange, O.L; Mooney, H.A; Schulze, E.-D; Sommer, U.; Ehleringer, James R.; Denise Dearing, M.; Cerling, Thure E. (Springer New York, 2005)