Related by context. Frequent words. (Click for all words.) 76 temperate zones 64 tropics 63 tropical climates 62 subtropical regions 61 temperate climates 60 latitudes 60 equatorial regions 59 milder winters 58 subtropics 58 mid latitudes 58 northern latitudes 57 cooler climates 56 Little Ice Age 55 terrestrial ecosystems 55 Northern Hemisphere 55 warmer climates 54 colder climates 53 arid regions 53 temperate 52 storminess 52 avian influenza viruses 52 equator 52 warm climates 52 genetic variability 51 Medieval Warm Period 51 herbaceous plants 51 mountain glaciers 51 northern hemisphere 51 warmer winters 51 hydrological cycle 51 equatorial 51 warmer temperatures 51 virulent strains 51 El Ninos 50 heatwaves 50 polar regions 50 atmospheric circulation 50 Migratory birds 50 Southern Hemisphere 49 aridity 49 cold winters 49 cold climates 49 nitrogen fixation 49 species extinctions 49 interglacial 49 bee populations 49 subtropical 49 climatic conditions 49 CO2 concentrations 49 temperate climate 48 deciduous trees 48 fungal spores 48 Droughts 48 equatorial Pacific 48 insect populations 48 boreal forests 48 biodiversity hotspots 48 forbs 48 glaciation 48 perennial grasses 48 droughts 47 species 47 crop yields 47 northern climes 47 multicellular organisms 47 climates 47 tropical rainforests 47 herbivores 47 diatom 47 mammalian species 47 influenza viruses 47 respiratory viruses 47 landmasses 47 glacial melt 46 nighttime temperatures 46 irrigated crops 46 drylands 46 stomata 46 Influenza viruses 46 Warmer temperatures 46 megafauna 46 H#N# viruses 46 warmer 46 wintering grounds 46 adelgid 46 ENSO 46 microclimates 46 volcanism 46 albedo 46 greenhouse warming 46 sunspot activity 46 semi arid 46 conifers 45 overwintering 45 Wolbachia 45 genetically diverse 45 savannas 45 speciation 45 fertile soils 45 overwinter 45 atmospheric CO2