Related by context. Frequent words. (Click for all words.) 61 marine sediments 61 terrestrial ecosystems 59 temperate forests 58 Arctic permafrost 57 montane 57 refugia 56 Biogeography 56 hydrologic cycle 56 Wadden Sea 55 deglaciation 55 tropopause 55 geomorphology 55 carbon dioxide concentrations 55 isotope ratios 55 Geochemistry 55 biogeochemical 55 Ice Ages 55 biogeochemistry 54 photosynthetic organisms 54 atmospheric CO 54 atmospheric ozone 54 plankton blooms 54 microbial ecology 54 atmospheric CO2 concentrations 54 Cenozoic 54 biogeography 54 NCAR scientist 53 icecaps 53 Alpine glaciers 53 Anthropogenic 53 diatom 53 humid tropical 53 clathrates 53 subtropical regions 53 microfossils 53 faunal 53 hydrological cycle 53 forcings 53 Melting glaciers 53 Svalbard archipelago 53 ocean acidity 53 atmospheric carbon dioxide 53 upper troposphere 52 glacial retreat 52 Quaternary 52 peat bogs 52 subarctic 52 poleward 52 CO2 concentrations 52 Paul Crutzen 52 acidify 52 atmospheric methane 52 coniferous forests 52 Gondwanaland 52 temperate zones 52 atmospheric CO2 52 lake sediments 52 tropospheric 52 methane CH4 52 systematics 52 temperate rainforest 52 Dry Valleys 52 Cyanobacteria 51 absorbs carbon dioxide 51 Helmholtz Centre 51 Microorganisms 51 freshwater ecosystems 51 nitrogen fixation 51 mud volcanoes 51 Tibetan Plateau 51 sediment cores 51 oxygen isotopes 51 aerosol particles 51 temperature gradients 51 El Nino Southern Oscillation 51 marine invertebrates 51 atmospheric nitrogen 51 permafrost 50 Snowball Earth 50 Late Cretaceous 50 atmospheric physicist 50 abiotic 50 glacial melt 50 biosphere 50 aragonite 50 biodiversity hotspots 50 undersea volcanoes 50 oxygen isotope 50 Climatic Change 50 paleoclimatologist 50 Ecology Letters 50 receding glaciers 50 atmospheric circulation 50 mesoscale 50 Phytoplankton 50 relict 50 planktonic 50 Siberian permafrost 50 interglacial 50 amphipods 50 atmospheric chemistry