And Climate

James R. Ehleringer 1. Introduction 267

Department of Biology 2. A Physiological Basis for C3/C4 Plant Distributions 268

Salt Lake City Utah A Brief I Iistory of Atmospheric Carbon Dioxide Levels 268

Thurc E Ccrling 4. Recognizing the Presence of C, and C4 Ecosystems in the Paleorecord 269

Department of Geology and 5. Global Expansion of C4 Ecosystems 270

Geophysics University 6 q/q Dynamics during Glacial-Interglacial Periods 272

Salt Lake City Utah ^■ Photosynthetic Pathway Distribution in the Modern World 273

8. Photosynthetic Pathway Impacts Herbivores 274

9. Summary 275

References 276

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