Historical geology Paleobotany 2 Paleoclimatology 2 Plants, Fossil 2 Animal ecology 1 Aquatic biology 1 Biogeomorphology 1 Coral reef ecology 1 Earth (Planet) 1 Earth-Evolution 1 Ecology 1 Environmental geology 1 Extinction (Biology) 1 Geoglogy-physical 1 Life sciences 1 Nature conservation 1 Nature-Effect of human beings on 1 Paleoanthropology 1 Paleoecology 1 Plant 1 Plant-atmosphere relationships 1 Plants 1 Plants--Evolution 1 atmosphere relationships 1