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(Click for frequent words.) 64 Himalayan glaciers 64 Himalayan glacier 63 Arctic icecap 63 alpine glaciers 62 Greenland Glaciers 62 glacial melting 62 Himalaya glaciers 61 Kilimanjaro glaciers 60 Antarctic glaciers 60 Greenland icesheet 59 Konrad Steffen 59 Melting Glaciers 59 melting Himalayan glaciers 58 receding glaciers 58 polar icecap 58 polar icecaps 57 Gangotri glacier 57 icecaps 56 Alpine glaciers 56 Syed Iqbal Hasnain 56 Antarctic Ice Shelf 56 Glaciers 56 Greenland glaciers 56 tropical glaciers 56 glaciers 56 Greenland Ice 55 disappearing glaciers 55 glacier melting 55 glacier melt 55 glacial melt 55 Melting glaciers 55 Service WGMS 55 Greenland icecap 55 melting icebergs 55 Climate Warming 55 Ozone Hole 54 glaciers melting 54 polar caps 54 sub glacial lakes 54 icesheet 54 Climate Change IPPC 54 glacial retreat 54 icesheets 54 Hongbin Qu chief 53 melting glaciers 53 Arctic permafrost 53 Warmer oceans 53 Plate Tectonics 53 glaciers melt 53 subglacial lakes 53 Himalayan river basins 53 glaciologists 52 Paleoclimate 52 kept mountainous snowbanks 52 glacier melts 52 climate modellers 52 Nature Geosciences 52 shrinking glaciers 52 Amundsen Sea 52 melting glacial 52 Amazonian forests 51 Julienne Stroeve 51 Appy Sluijs 51 Snowball Earth 51 mountain glaciers 51 Ozone Depletion 51 Sugata Hazra 51 glacial meltwater 51 Mount Kilimanjaro glaciers 51 Rignot 51 Glaciers Melting 51 melt Himalayan glaciers 51 icecap 51 Laurentide Ice Sheet 51 glacier 51 Benjamin Santer 51 Tropical Meteorology IITM Pune 51 climate modelers 51 polar ice 51 Melting Arctic 51 Solar Flares 51 Global Warming 51 mountain snowpacks 51 Tibetan Plateau 50 Hamish Pritchard 50 Gangotri Glacier 50 GLOF 50 acidic oceans 50 glacier shrinkage 50 Sceptical Environmentalist 50 Eric Rignot 50 Velicogna 50 Seafloor 50 Keeling Curve 50 sheet Summerhayes 50 Surface Temperature 50 glacier calving 50 Qinghai Tibet plateau 50 permafrost thaws 50 Siberian permafrost 50 melting 50 Anthropogenic 50 Antartic 50 snowcaps 50 Sheet WAIS 50 atmospheric CO2 levels 50 interannual variability 50 Climate Change IPCC 50 boreal regions 50 melting permafrost 50 Laurentide ice sheet 50 cryosphere 50 Greenland ice 49 Otto Bliesner 49 Greenland glacier 49 Jellyfish swarm northward 49 GISS analysis 49 iceberg calving 49 anthropogenic climate 49 journal Meteoritics 49 moulins 49 melting glacier 49 shadowed craters 49 Glaciergate 49 Hawking Radiation 49 Greenland Antarctica 49 deglaciation 49 Anthropogenic Global Warming 49 Extraterrestrial Life 49 Ocean Acidification 49 Himalayan Geology 49 IPCC Intergovernmental Panel 49 ocean basins 49 Deccan Traps 49 glacier retreat 49 molten magma 49 Permafrost 49 Inter Governmental Panel 49 Svensmark 49 Robert Bindschadler 49 paleomagnetic 49 glaciers retreating 49 Josefino Comiso 49 Intergovernment Panel 49 Norphel 49 Andean snowmelt 49 Geoengineering 49 melting ice 49 subglacial 49 manmade global warming 49 Melting 49 Himalayan glaciers melting 49 albedo feedback 49 Rahmstorf 49 Solar Terrestrial Physics 49 Martian gullies 49 retreating glaciers 49 perma frost 49 anthropogenic warming 49 permafrost melts 49 Jay Zwally 49 Georg Kaser 48 species extinctions 48 Sermeq Kujalleq 48 equatorial latitudes 48 subsurface ocean 48 moon gravitational pull 48 thawing permafrost 48 Easy Tec 48 Ocean acidification 48 cave stalagmites 48 Biogeography 48 Pachauri 48 Mathematical Modelling 48 Asteroid Impact 48 Climategate emails 48 Antarctic icecap 48 Atlantic Multidecadal Oscillation AMO 48 glassy coating 48 permafrost soils 48 IPCC AR4 48 NSIDC 48 Asteroid Apophis 48 Climatic Change 48 atmospheric methane 48 Milankovitch 48 Antarctic Ice 48 melted glacial 48 lithosphere 48 Stefan Rahmstorf 48 tectonic uplift 48 journal Geophysical Research 48 surface temperatures SSTs 48 isostatic rebound 48 glacial ice 48 martian atmosphere 48 vapor condenses 48 Saturn moon Mimas 48 Extrasolar Planet 48 Aiguo Dai 48 Glacier Monitoring 48 global warming alarmists 48 midlatitudes 48 ozone layer depletion 48 Amundsen Sea Embayment 48 Gabriel Vecchi 48 sulphate aerosols 48 anthropogenic aerosols 48 Syed Hasnain 48 sediments deposited 48 thawing tundra 48 Climategate scandal 47 IPCC 47 Corinne Le Quéré 47 Roger Pielke Jr. 47 clogs airways 47 Organic Molecules 47 atmospheric CO2 47 Cryospheric Sciences Branch 47 World Meteorological Organisation 47 Feedbacks 47 Siple Dome 47 Peter Jenniskens 47 Toba eruption 47 coccolithophores 47 antarctic 47 antarctic ice 47 Acidification 47 pteropod 47 Global Warming Hysteria 47 micro meteorites 47 Antarctic ice 47 worsening droughts 47 NASA QuikScat satellite 47 Last Glacial Maximum 47 sterile neutrino 47 Vatnajökull 47 Anthony Barnosky 47 seabed sediments 47 methane clathrate 47 acidifying oceans 47 Anthropogenic Global Warming AGW 47 journal Palaios 47 methane clathrates 47 VK Raina 47 Scott Luthcke 47 anomalously warm 47 megafauna extinction 47 Jakobshavn Glacier 47 Friis Christensen 47 Extinctions 47 Nasa Goddard Institute 47 atmospheric carbon dioxide 47 Patagonian Andes 47 Lake Untersee 47 Cryosphere 47 Cryogenian 47 sealevel 47 Dhauladhar range 47 paleoclimate 47 outlet glaciers 47 Richard Lindzen 47 Glaciology 47 meltwater 47 AGW theory 47 Glacier Melt 47 Volcanic Activity 47 Warmists 47 glaciers melted 47 melting Arctic 47 silicate rocks 47 tropical coral reefs 47 speleothems 47 Narwhals 47 Bjørn Lomborg 47 heatwaves floods droughts 47 anthropogenic emissions 47 permafrost 47 Atlantic thermohaline circulation 47 Methane Emissions 47 Geophysical Research 47 paleoclimatic 47 cometary dust 47 asteroid impacts 47 isotherms 47 magnetic monopoles 47 Julia Slingo 47 globalwarming 47 Exoplanet 46 Martian dust 46 Thorthormi 46 Andean glaciers 46 Medieval Warming Period 46 lunar crust 46 climatologists 46 Geomorphology 46 hydrological cycle 46 pteropods 46 heatwaves droughts 46 Extrasolar 46 Asteroid Itokawa 46 Thawing permafrost 46 Ulysses spacecraft 46 Mojib Latif 46 Manmade 46 anthropogenic greenhouse gases 46 Climactic 46 Zeebe 46 poleward shift 46 springtime ozone 46 Warming temperatures 46 Quaternary Period 46 Shrinking glaciers 46 Mass Extinctions 46 upwellings 46 warmer wetter winters 46 Cretaceous Tertiary KT 46 Alaskan glaciers 46 Lindzen 46 greenhouse warming 46 ice lingam 46 Kenneth Libbrecht 46 Climate Change Impacts 46 Patagonian glaciers 46 Dorthe Dahl Jensen 46 Jakobshavn Isbrae 46 teleconnections 46 oceanic circulation 46 International Geosphere Biosphere 46 Skeptical Environmentalist Guide 46 Bering Glacier 46 aerosol concentrations 46 Capricorn Glacier 46 Ozone depletion 46 anthropogenically 46 ice bergs 46 Paleocene Eocene Thermal Maximum 46 Andrew Dessler 46 Raman Effect 46 Coral Reefs 46 meteor impacts 46 Mary Stampone 46 Warmest Year 46 stratospheric ozone 46 climategate emails 46 melt glaciers 46 iridium layer 46 Palaeocene Eocene Thermal Maximum 46 storied snows 46 Climate Change IPCC Rajendra 46 Martian Soil 46 icefields 46 overlying layers 46 Climate Change Rajendra Pachauri 46 Andreas Schild 46 atmospheric aerosols 46 Svante Arrhenius 46 Scientists Warn 46 cryovolcanism 46 Marika Holland 46 Cosmic Microwave Background 46 Rossby waves 46 Bjorn Lomborg author 46 wispy cirrus clouds 46 water vapor condenses 46 Kolahoi 46 cratons 46 Mars Orbiter 46 glaciers recede 46 polar vortex 46 Planetary Change 46 cloud microphysics 46 missing baryons 46 Malte Meinshausen 46 Antarctic ozone 46 Antarctic glacier 46 warmists 46 topmost layer 46 tropospheric temperature 46 Glaciologists 46 melting polar 46 Copenhagen Diagnosis 46 Pareechu 46 Indian climatologist Rajendra 46 warmings 46 supercomputer simulations 46 NASA Wilkinson Microwave 46 martian meteorites 46 thermohaline circulation 46 journal Climatic Change 46 protective ozone layer 46 CRU emails 45 Zoological Survey 45 Ionospheric 45 Shivlingam 45 palaeoclimate 45 equatorial bulge 45 snowcap 45 halogenated gases 45 Shakhova 45 Saturn Enceladus 45 sulfur isotope 45 Ice Ages 45 lunar meteorites 45 Medieval Warm Period MWP 45 Atlantic meridional overturning 45 Gangetic dolphins 45 Tulaczyk 45 methane hydrates 45 Syun Ichi Akasofu 45 planetary warming 45 upper troposphere 45 glaciological 45 Joan Kleypas 45 flood basalts 45 NIPCC 45 clathrates 45 Woolly mammoth 45 receding glacier 45 volcanic plumes 45 meteoritic 45 Halifax Weather Overcast 45 CO2 concentrations 45 journal Geology 45 Saturn moon Enceladus 45 journal Nature Geoscience 45 Ted Scambos 45 COROT 7b 45 Carbon Dioxide 45 strontium isotope 45 seals walrus 45 permanently shadowed craters 45 Sumatra Andaman earthquake 45 floods heatwaves 45 Corinne Le Quere 45 oceans 45 Jakobshavn 45 ejecta plume 45 Arctic Ocean 45 Larsemann Hills 45 hydrologic cycle 45 reactive nitrogen 45 Cometary 45 Eemian 45 thermally activated 45 authoritative Intergovernmental Panel 45 Gerald Meehl 45 McMurdo Dry Valleys 45 Ozone layer 45 basaltic rocks 45 seafloor sediments 45 crustal rocks 45 glaciers retreated 45 temperature reconstructions 45 Govindasamy Bala 45 paleoclimatology 45 ocean acidity 45 Environmental Degradation 45 supercooling 45 melts Himalayan glaciers 45 climatic variations 45 West Antarctic icesheet 45 Lunar Laser Ranging 45 GtC 45 fearsome Tyrannosaurus rex 45 Melting ice 45 ClimateGate 45 Puijila 45 decadal variability 45 Cosmic Rays 45 Mount Bosavi 45 surface hoar 45 Pachauri IPCC 45 Astronomers Find 45 Le Quéré 45 Luterbacher 45 Fermi Telescope 45 Liquid nitrogen 45 cosmic ray flux 45 Weekly Mulch 45 Lake Vostok 45 thermal inertia 45 Skeptical Environmentalist 45 Climate Prediction 45 Siberian Traps 45 Eduardo Zorita 45 conodonts 45 glaciologist 45 KT boundary 45 abyssal plains 45 Arid Regions Environmental 45 arctic plains 45 Norwegian Polar 45 magma ocean 45 QQ# 45 Kharecha 45 Global Precipitation Climatology 45 NASA Cassini 45 Ross Salawitch 45 heatwaves floods 45 Indian Ocean Dipole 45 waves droughts floods 45 Climate Variability 45 Abrupt Climate Change 45 Polar Regions 44 Amazon rainforests 44 AGW hypothesis 44 Chief Executive Jasmine Whitbread 44 Climate Impacts 44 NASA satellites orbiting 44 climate alarmism 44 Philip Mote 44 Gaumukh 44 Climategate 44 EFIRE 44 Brenda Ekwurzel climate 44 mineral olivine 44 Gamma ray burst 44 icy comets 44 advection 44 sulphate particles 44 cometary impacts 44 Gangetic 44 Dobhal 44 towering icebergs 44 2oC 44 permafrost degradation 44 sulfate aerosols 44 Ecoscience Population Resources 44 Applied Meteorology 44 ozone layer shielding 44 Glacial melt 44 interferometric synthetic aperture radar 44 Martian craters 44 IPCC TAR 44 coolings 44 megaquakes 44 SPICAM 44 damaging ultraviolet radiation 44 Venusian atmosphere 44 chairman climatologist Rajendra 44 Mars orbiting spacecraft 44 meteorite impacts 44 Single Molecules 44 deep convective clouds 44 weather beaten sunbleached 44 Wilkins Ice Shelf 44 Saturnian moon 44 midlatitude 44 climatic variability 44 Antarctica 44 GLOBAL WARMING 44 Neutron Detector 44 NCAR scientist Synte Peacock 44 Climate Change 44 Hotter drier 44 crustal thickness 44 Grimsvotn signaling 44 mesosphere 44 Wilfried Haeberli 44 golden toad 44 gyres 44 Indo Gangetic plains 44 martian rocks 44 foehn 44 Amstrup 44 Himalayas 44 William Kininmonth 44 Sallie Baliunas 44 albedo 44 exosphere 44 Alexander Goncharov 44 ozone depleting gases 44 temporal variability 44 Ares Vallis 44 Mars Analog Svalbard 44 Henrik Svensmark 44 Madden Julian Oscillation 44 #.#C #.#F [003] 44 Ayles Ice Shelf 44 Cumbre Vieja 44 Fram Strait 44 Risks Posed 44 C# atmospheric concentrations 44 droughts floods heatwaves 44 poleward 44 erratic monsoons 44 ozone depletion 44 lake sediments 44 cosmic ray intensity 44 tephra dam 44 Min Temp #.# 44 Atmospheric Chemistry 44 gaseous methane 44 Superheated 44 NASA Cassini spacecraft 44 Neukum 44 GKSS Research 44 Blair Trewin 44 Murari Lal 44 Alpine glacier 44 Grímsvötn volcano 44 anthropogenic carbon dioxide 44 Fred Hoyle 44 chinar leaves 44 Climate alarmists 44 Synte Peacock 44 supercooled droplets 44 Tropical Meteorology Pune 44 Cosmological 44 Nate Mantua 44 AGW proponents 44 lightless depths 44 Volcanic gases 44 warmist 44 James Lovelock 44 Greenhouse Effect 44 atmospheric nitrogen 44 Achin Vanaik 44 Mark Serreze 44 polar oceans 44 Melas Chasma 44 chondrules 44 refrozen ice 44 melting glaciers disappearing 44 Earth ozone layer 44 Tropical Meteorology 44 Spencer Weart 44 asthenosphere 44 Warmer seas 44 Yield Clues 44 glacial shrinkage 44 Sr Ca 44 Jupiter moons Europa 44 Noaa 44 spacecraft flyby 44 cyclonic storms 44 DOI #.# 44 solidified lava 44 icy crust 44 tropospheric 44 Natalie Mahowald 44 Gaia Theory 44 benthos 44 Supermoon 44 stony meteorites 44 Scambos 44 Arctic 44 Quelccaya 44 silicate dust 44 Thawed 44 decadal 44 chondritic meteorites 44 arctic permafrost 44 climategate affair 44 Shivaliks 44 Guhathakurta 44 Wallace Broecker 44 multi decadal 44 Crutzen 44 Galileo spacecraft 44 duststorms 44 manmade CO2 emissions 44 deforestation desertification 44 BN Goswami 44 tectonic plate movements 44 yardangs 44 tropical troposphere 44 subtropical oceans 44 Veerabhadran Ramanathan 44 presolar grains 44 Ignatius Rigor 44 Misleading Claims 43 SCIENCE MATTERS 43 earths surface 43 Bug Nebula 43 Coral Bleaching 43 THEMIS Image 43 decadal scale 43 Stimulated Emission 43 Einstein relativity theory 43 smoggy atmosphere 43 convective clouds 43 Max Temp 43 carbon dioxide concentrations 43 Roger Pielke Sr. 43 arctic 43 Martian rovers 43 Spectroradiometer 43 stratospheric ozone depletion 43 amplification Zwally 43 climategate controversy 43 Prydz Bay 43 Younger Dryas 43 Spectroscopic 43 Climate Impact 43 Global warming 43 Gangetic dolphin 43 DP Dubey 43 Biodiversity TEEB 43 lobate 43 mesospheric 43 sedimentary layers 43 Soil Moisture 43 ESA Mars 43 sun irradiance 43 Pierre Friedlingstein 43 Harvati 43 polar mesospheric clouds 43 water vapor 43 equatorial Pacific Ocean 43 Cloudiness 43 axial tilt 43 Katharine Willett 43 SC Bhan 43 Glaciers melting 43 Himalayan Glaciology 43 Global Warming Emissions 43 Molnia 43 Arctic oscillation 43 planktons 43 Ian Joughin 43 Dr Pachauri 43 lunar magma 43 Permian Triassic 43 subpolar 43 Plate tectonics 43 Ontario Lacus 43 taiga forest 43 Analyzer TEGA 43 Tharsis Rise 43 cosmic collisions 43 glacial lakes 43 Changing Climate 43 #.#C [004] 43 crustal movements 43 Superstorm 43 supercooled liquid 43 Hindu Kush Himalayan 43 anthropogenic global warming 43 radar altimetry 43 ocean acidification 43 polar craters 43 Natalia Shakhova 43 Elemental mercury 43 AR4 43 Ice Age glaciers 43 stratospheric clouds 43 ammonia hydrates 43 lava fountains 43 Alaskan permafrost 43 Isabella Velicogna 43 wolverine habitat 43 clumpiness 43 Wetness 43 Quelccaya ice cap 43 #.#-#.# degrees Fahrenheit [002] 43 ppmv 43 atmospheric CO 43 lithospheric 43 volcanoes erupt 43 crossbedding 43 Jon Ove Hagen 43 planets atmospheres 43 Deccan plateau 43 Serreze 43 abyssal 43 Climatological 43 Meteorology Geophysics 43 Vernon Kousky NOAA 43 explosive volcanism 43 atmospheric oceanic 43 hydroxyl molecules 43 Helheim glacier 43 glacial interglacial cycles 43 Yellowstone Caldera 43 paleoenvironmental 43 atmospheric moisture 43 Antarctic penguins 43 supervolcanoes 43 Global Warming Hoax 43 Nares Strait 43 Asteroid Collision 43 forams 43 Composite Infrared Spectrometer 43 GHG concentrations 43 deca BDEs 43 Mini SAR 43 9NEWS Meteorologist Ashton Altieri 43 meteoritic material 43 meridional overturning circulation 43 basaltic magma 43 rusticles 43 Permian extinction 43 Iran Nuclear Ambitions 43 Woolly mammoths 43 interglacial period 43 megadroughts 43 lunar soil 43 Eyjafjallajokull Volcano 43 Medieval Warm 43 penetrating radar 43 global weirding 43 La Niña winters 43 Cassini flyby 43 Alarmist 43 NOAA Geophysical Fluid 43 melting icecaps 43 Randy Julander supervisor 43 snowline 43 supervolcano 43 COLDER 43 Prof CNR Rao 43 ice melts 43 Advanced Microwave Scanning 43 thins bones 43 RV Polarstern 43 Ilulissat glacier 43 Iqbal Hasnain 43 Pastoruri 43 atmospheric concentrations 43 NASA GISS 43 WISE telescope 43 Saturn moon 43 Tropospheric 43 blocks harmful ultraviolet 43 Camilla Toulmin 43 Tunguska explosion 43 shadowy craters 43 Antarctic icebergs 43 ALH# 43 NCMRWF 43 degree Centigrade 43 Climate Change UNFCC 43 El Nio 43 Impacts Adaptation 43 ESA Envisat satellite 43 marine sediments 43 tiny single celled 43 Madhav Chitale 43 Corot 7b 43 Pielke 43 expose lairs 43 Sinus Meridiani 43 global warming 43 Compact Reconnaissance Imaging Spectrometer 43 mammal extinctions 43 supersymmetric particles 43 Richard Lindzen professor 43 Management Institute IWMI 43 Tropical Meteorology IITM 43 Rune Graversen 43 Unseasonable 42 gas hydrates 42 Cow Manure 42 southernmost continent 42 Schellnhuber 42 meltwater stonefly 42 megafaunal 42 Iceland Volcano Eruption 42 Danish statistician 42 Fossil Fuels 42 magnetic substorms 42 Nature Geoscience 42 Endangerment Finding 42 meteorite bombardment 42 hydrosphere 42 groundwater depletion 42 Jean Pierre Bibring 42 Multiscale Modeling 42 sediment cores 42 Arctic ice floe 42 oxygen isotopic composition 42 mountain pygmy possum 42 moon Enceladus 42 paleoclimatologist 42 Earth Observation Programmes 42 Holocene epoch 42 seafloor methane 42 Chemtrails 42 Ozone Levels 42 Kittlitz murrelet 42 twin STEREO spacecraft 42 sunspot cycles 42 Meterological Department 42 carbonate globules 42 Bill Patzert climatologist 42 abyssal depths 42 WMO 42 Orbiter MRO 42 chlorophyll fluorescence 42 Greg Spoden 42 Weddell Sea 42 Whillans Ice Stream 42 Casas Geo subdivision 42 Inundation 42 Nisqually Glacier 42 global warming skeptics 42 Joel Primack 42 ionized particles 42 NASA Spacecraft 42 chlorine monoxide 42 icebergs calving 42 crystalline solids 42 Walruses dive 42 mountaintop glaciers 42 seafloors 42 Gomukh 42 lowermost mantle 42 Deniers 42 Mountain Development ICIMOD 42 earthquakes volcanoes 42 calcium carbonate shells 42 Kangerdlugssuaq 42 Climatic 42 Klekociuk 42 Earthly contamination 42 La Nina occurs 42 Endangered Whales 42 fine grained sediment 42 Dev Niyogi 42 Khumbu Glacier 42 moon permanently shadowed 42 Nanomaterial 42 Eyjafjallajoekull glacier 42 Environment Programme Unep 42 degree centigrade 42 Microbial Biotechnology 42 Solar Radiation 42 cow farts 42 #-#.# degrees Fahrenheit 42 Regolith 42 Higgs bosons 42 cumulus cloud 42 Tectonic plates 42 melting polar icecaps 42 laser altimeter 42 Global Biogeochemical Cycles 42 Martian microbes exist 42 Jevrejeva 42 downwelling 42 Opposes drilling 42 Scheraga 42 floods droughts 42 NASA ICESat 42 Climate Extremes 42 Aletsch glacier 42 lunar craters 42 Soufriere Hills Volcano 42 Meteoritics 42 Noachian 42 Jayant Narlikar 42 glacial 42 NASA Tropical Rainfall 42 Cold Dark Matter 42 unthawed 42 global warmists 42 semiarid regions 42 Planck satellite 42 Oldest Known 42 Mark Serreze senior 42 palaeo 42 hotter drier summers 42 glacial interglacial 42 atmospheric ozone layer 42 Madhav Gadgil 42 Weiqing Han 42 Greenhouse Gas Bulletin 42 bioavailable iron 42 boreal ecosystems 42 Grímsvötn 42 Martian dunes 42 basaltic rock 42 NASA Mars Orbiter 42 forcings 42 Coral reef 42 Weather Forecasting NCMRWF 42 Siberian tundra 42 SeaWiFS 42 Melting Snow 42 Qiang Fu 42 neutron spectrometer 42 Global Warming Alarmists 42 supercontinents 42 aragonite 42 mantle convection 42 colliding tectonic plates 42 plate tectonics 42 Olduvai 42 Envisat satellite 42 UVIS instrument 42 gastropods 42 Cosmic Microwave Background CMB 42 refroze 42 Antarctic krill 42 Xiaodong Song 42 western Antarctic Peninsula 42 Climate Impact Assessment 42 atmospheric chemistry