[UNKNOWN: PRESTIME] Ehleringer, James^*,1, Cerling, Thure¹, ¹ University of Utah, Salt Lake City, UT What controls the historical and current abundances of C4 plants.

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[UNKNOWN: PRESTIME] Ward, Joy^*,1, Ehleringer, James¹, ¹ University of Utah, Salt Lake City, UT Physiological and evolutionary responses of plants to low CO₂ of the late Pleistocene.

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[UNKNOWN: PRESTIME] SMITH, WILLIAM^*,1, JACKSON, STEPHEN², ¹ Wake Forest University, Winston-Salem, North Carolina² University of Wyoming, Laramie, Wyoming Quaternary carbon dioxide concentrations: a comeback for cold-adapted conifers.

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[UNKNOWN: PRESTIME] LEVIS, SAMUEL^*,1, ¹ NATIONAL CENTER FOR ATMOSPHERIC RESEARCH, BOULDER, CO CO₂ -climate-vegetation interactions at the LGM as simulated by a coupled climate-vegetation model.

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[UNKNOWN: PRESTIME] Break.

[UNKNOWN: PRESTIME] Huang, Yongsong^*,1, Shuman, Bryan¹, Wang, Yi¹, Jacobson, George², Grimm, Eric³, Webb, Thompson¹, ¹ Department of Geological Sciences, Providence, RI 02912² Institute for Quaternary and Climate Studies, Orono, ME 04469³ 3Illinois State Museum, Springfield, IL 62703 Climate and vegetation change inferred from hydrogen and carbon isotope variations of land-plant biomarkers from Lake Tulane sediment during the last glacial-interglacial cycle.

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[UNKNOWN: PRESTIME] Van de Water, Peter^*,1, ¹ Institue of Arctic and Alpine Research, Boulder, CO Ecophsyiological and morphological changes in plant macrofossils in response to CO₂ shifts during the terminal Pleistocene.

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[UNKNOWN: PRESTIME] Jackson, Robert^*,1, Gill, Richard², Polley, H³, Johnson, Hyrum³, Maherali, Hafiz¹, Anderson, Laurel⁴, ¹ Duke University, Durham, NC² Washington State University, Pullman, WA³ USDA-ARS Grassland, Soil and Water Research Laboratory, Temple, TX⁴ Ohio Wesleyan University, Delaware, OH Grassland responses to past and future atmospheric CO2.

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