1. L.H. Jr. Allen, and J.S. Amthor .1995. Plant physiological response to elevated CO2, temperature, air pollution and UV-B radiation. In G.M. Woodwell and F.T. Mackenzie, Eds. Biotic Feedbacks in the Global Climatic System: Will the Warming Feed the Warming ?Oxford University Press,New York, pp.51 -84 .