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.,; Dearing, M. Denise,; Cerling, Thure E.,; Dearing, M. Denise, (Springer, 2005)