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(Click for frequent words.) 72 Earth ozone layer 71 Ozone layer 70 stratospheric ozone 68 protective ozone layer 68 stratospheric ozone layer 64 ozone depletion 60 Ozone Layer 60 ozone 59 chlorofluorocarbons 58 Antarctic ozone 57 CFCs 55 ozone depleting gases 55 Montreal Protocol 55 chlorofluorocarbons CFCs 53 ozone depleting substances 53 Ozone depletion 53 ozone depleting chemicals 52 CFCs chlorofluorocarbons 51 harmful ultraviolet radiation 51 ultra violet radiation 51 atmospheric ozone 51 chloroflourocarbons 50 Antarctic ozone layer 50 polar regions 50 sulphate aerosols 49 hydrochlorofluorocarbons HCFCs 49 icecaps 49 ozone depleting compounds 49 ultraviolet UV rays 49 biosphere 48 atmospheric CO2 48 atmospheric ozone layer 48 greenhouse warming 48 stratospheric ozone depletion 48 ozone depleting substance 47 HCFCs 47 hydrological cycle 47 Chlorofluorocarbons CFCs 47 halons 47 ozone layer shielding 47 global warming 47 refrigerants 47 sulfate aerosols 47 atmospheric carbon dioxide 47 planet 47 fluorocarbons 47 chlorofluorocarbons CFC 47 springtime ozone 47 Greenland ice 47 ultra violet rays 46 harmful ultraviolet UV radiation 46 Ultraviolet rays 46 carbon dioxide concentrations 46 acid rain 46 atmospheric CO2 levels 46 Greenland icesheet 46 oceans 46 carbon dioxide 46 aerosols 46 Stratospheric ozone 46 Ultraviolet radiation 46 chlorofluorocarbon 46 Greenhouse gasses 46 ozone layer depletion 46 Chlorofluorocarbons 46 damaging ultraviolet rays 46 Ozone 46 sun ultraviolet radiation 46 Ocean acidification 46 anthropogenic emissions 46 deplete ozone 45 ultraviolet UV radiation 45 CO2 45 thermosphere 45 fluorinated gases 45 depleting substances 45 polar caps 45 carbon dioxide CO2 45 ozone depleting 45 polar ice 45 ozone depleting chlorofluorocarbons 45 greenhouse gas concentrations 45 depleting ozone layer 45 martian atmosphere 45 ozone depleting CFCs 44 chlorofluorocarbon gases 44 carbon sinks 44 Antarctic ice 44 Carbon dioxide 44 CO2 concentrations 44 coral reefs 44 ultraviolet UV light 44 sun ultraviolet rays 44 greenhouse gases 44 atmospheric methane 44 sulphate particles 44 deforestation overfishing 44 mesosphere 44 icesheet 44 hydrofluorocarbons HFCs 44 aerosol particles 44 HCFC 44 Ozone Hole 44 Greenhouse gases 44 greenhouse gasses 44 blocks harmful ultraviolet 44 Arctic icecap 44 invisible odorless tasteless 43 GHG concentrations 43 dermal layers 43 hydrofluorocarbon 43 Arctic permafrost 43 anthropogenic greenhouse gases 43 acidification 43 rainforests 43 potent greenhouse gas 43 exosphere 43 aerosol propellants 43 R #a refrigerant 43 anthropogenic warming 43 boreal forest 43 nitrous oxide N2O 43 cosmic rays 43 galactic cosmic rays 43 greenhouse gases GHGs 43 greenhouses gases 43 polar icecap 43 ozone depleting chlorofluorocarbons CFCs 43 terrestrial ecosystems 42 melting permafrost 42 methyl bromide 42 hydrofluorocarbon HFC 42 Ozone Depletion 42 Braathen 42 Thawing permafrost 42 peatlands 42 Ozone Depleting Substances ODS 42 Carbon Dioxide 42 permafrost 42 tailpipe gases 42 methyl chloroform 42 harmful ultraviolet 42 chlorine monoxide 42 anthropogenic CO2 emissions 42 ocean acidification 42 permafrost thaws 42 shrinking glaciers 42 atmospheric CO2 concentrations 42 atmospheric concentrations 42 sulfur dioxide SO2 42 Carbon dioxide CO2 42 water vapor 42 CFC propellants 42 Amazon rainforest 42 mountain glaciers 42 Antarctic glaciers 42 Persistent Organic Pollutants 42 gaseous pollutants 42 hydrofluorocarbons 41 harmful gasses 41 sun UV rays 41 N2O 41 Global Warming 41 glaciers 41 gases 41 ocean acidity 41 GJ#b 41 Nitrogen oxides 41 Halons 41 marine ecosystems 41 boreal forests 41 biodiversity 41 nitrogen trifluoride 41 Earth 41 ultraviolet rays 41 Venusian atmosphere 41 Antarctic stratosphere 41 melting icebergs 41 midlatitudes 41 greenhouse gases GHG 41 tropospheric ozone 41 sulfate aerosol 41 CO ² 41 ocean ecosystems 41 Warmer oceans 41 harmful ultraviolet rays 41 Global warming 41 atmospheric CO 41 halon 41 greenhouse gas 41 Kharecha 41 cow flatulence 41 peat soils 40 climate change 40 sulfuryl fluoride 40 cow farts 40 thirdhand smoke 40 amphibian populations 40 marine ecosystem 40 Palaeocene Eocene Thermal Maximum 40 chlorofluorocarbon CFC 40 photoaging 40 Jellyfish swarm northward 40 planetary warming 40 melting glaciers 40 Govindasamy Bala 40 alpine glaciers 40 troposphere 40 Saharan dust 40 gobal warming 40 Le Quere 40 tropical forests 40 Xuebin Zhang research 40 solar flares 40 El Nino periodic 40 burning fossil fuels 40 Mount Kilimanjaro glaciers 40 cryosphere 40 ultraviolet radiation 40 Shchuchye facility 40 permafrost melts 40 Hawking radiation 40 damaging ultraviolet radiation 40 sulfur hexafluoride 40 globalwarming 40 harmful ultra violet 40 ozone O3 40 acidifying 40 chlorine peroxide 40 anthropogenic climate 40 melt glaciers 40 nightglow 40 retreating glaciers 40 Einstein relativity theory 40 hydroxyl radicals 40 UV rays 40 halogenated hydrocarbons 40 albedo 40 aquatic ecosystems 40 oceanic circulation 40 co2 40 melt Himalayan glaciers 40 oxide hydrofluorocarbons perfluorocarbons 40 chemtrails 40 boreal ecosystems 40 earths 40 asbestos fireproofing 40 GHGs 40 Himalayan Glaciers 40 Greenland glaciers 39 manmade global warming 39 gasses 39 Orbiting Carbon Observatory OCO 39 deca BDEs 39 peat lands 39 greenhouse gas nitrous oxide 39 manmade CO2 emissions 39 coastal ecosystems 39 mangrove forests 39 WMO 39 reef habitats 39 ultraviolet sunlight 39 ecosystems 39 HFC refrigerants 39 Fashion Movie Reviews 39 hydroxyl radical 39 greenhouse emissions 39 glacier melts 39 anthropogenic CO2 39 thermohaline circulation 39 Anthropogenic 39 Atmospheric CO2 39 UVA radiation 39 biodiverse ecosystems 39 tooth enamel 39 Kyoto Protocal 39 emmissions 39 hydrazine tank 39 produced Friedlingstein 39 absorbs CO2 39 aerosol spray cans 39 2C #.#F 39 Boreal forests 39 hydrologic cycle 39 galaxy supermassive black 39 heat trapping carbon dioxide 39 HFC #a 39 Global Warming Potential GWP 39 ppmv 39 deforestation 39 sulphates 39 thinning ozone layer 39 Ultrafine particles 39 polar icecaps 39 Svedhem 39 honeybee population 39 atmospheric aerosols 39 tropical rainforests 39 stockpiled cluster munitions 39 Upsilon Andromedae b 39 Keck Interferometer 39 dustier stormier atmosphere 39 micro meteorites 39 halocarbons 39 sea turtle populations 39 UV radiation 39 icesheets 39 anthropogenic global warming 39 Le Quéré 39 meltwater 39 Antarctica 39 Martian atmosphere 39 COROT 7b 39 magnetic substorms 39 Co2 39 vulnerable thermal shielding 39 World Meteorological Organization 39 absorbs carbon dioxide 39 ultra violet UV rays 39 sunspots 39 absorb carbon dioxide 39 chemical ammonium perfluorooctanoate 39 runaway greenhouse 39 radioactive nuclei 39 Amazon rainforests 38 ice nucleation 38 cosmic collisions 38 rainforest 38 global warming alarmists 38 volcanic eruptions 38 scarps indicating 38 IPCC 38 glycation 38 sun harmful ultraviolet 38 HFCs 38 carbondioxide 38 coral bleaching 38 anthropogenic greenhouse gas 38 UV ray 38 photochemical smog 38 glacial interglacial cycles 38 stratospheric clouds 38 Amazonian forests 38 disappearing glaciers 38 upper troposphere 38 coccolithophores 38 strangelets 38 heat trapping pollutants 38 Ultraviolet light 38 refrigerant gases 38 acidic oceans 38 Earth biosphere 38 Contrails 38 Ulysses spacecraft 38 reefs 38 methane 38 glacier melting 38 Siberian permafrost 38 EPA Greenhouse gases 38 warmings 38 hydro chlorofluorocarbons 38 UVA UVB rays 38 Greenland Ice 38 Volatile organic compounds 38 global warming gasses 38 N2O emissions 38 orbiting Hubble Space Telescope 38 melting 38 sulfur aerosols 38 radiative forcing 38 rig derrick unfurling 38 icecap 38 biomagnification 38 bee populations 38 NOAA ESRL 38 Stomach banding causes 38 Ozone depleting substances 38 volcanoes erupt 38 Laurentide ice sheet 38 freshwater ecosystems 38 planetwide 38 subglacial lakes 38 perfluorocarbons PFCs 38 warming gases 38 oVOCs 38 degraded ecosystems 38 dental amalgam 38 lithosphere 38 atmospheric CO2 concentration 38 refrigerant 38 planet magnetosphere 38 sunspot activity 38 glacial melting 38 GLOBAL WARMING 38 pesticides herbicides fungicides 38 greenhouse gases emitted 38 silicon monoxide 38 Maunder minimum 38 tropical deforestation 38 Patagonian glaciers 38 CO ₂ 38 endangered rainforests 38 Persistent Organic Pollutants POPs 38 radioactive decay 38 airglow 38 sulfate particles 38 Rossby waves 38 bleaching 38 heliosphere 38 Atlantic thermohaline circulation 38 Alpine glaciers 38 melting polar 38 reef ecosystems 38 Eyjafjoell eruption 38 Svante Arrhenius 38 subsurface ocean 37 monoxide 37 Polycyclic aromatic hydrocarbons 37 manmade greenhouse gas 37 Boreal forest 37 permafrost degradation 37 coral reef ecosystems 37 UVC rays 37 Environment Programme UNEP 37 CFCs HCFCs 37 carbon emmissions 37 polar vortex 37 atmospheric 37 climate modelers 37 amplification Zwally 37 Ozone depleting 37 hydrochlorofluorocarbon HCFC 37 dental enamel 37 tiny airborne particles 37 Lunny oyster farm 37 asteroid impacts 37 smallpox viruses 37 Kyoto protocol 37 coastal wetlands 37 World Meteorological Organisation 37 Luterbacher 37 volcanic plume 37 deglaciation 37 Canada Boreal Forest 37 Orbiting Carbon Observatory 37 carbon dioxide CO ² 37 #yf 37 glacier melt 37 gases emitted 37 Phytoplankton 37 endocrine disruptor 37 oxidants 37 dangerously overheat 37 planet habitability 37 Polar Regions 37 carbon tetrachloride 37 atmospheric circulation 37 reactive nitrogen 37 ionised 37 strangelet 37 DDT pesticide 37 Climategate scandal 37 smallest exoplanet 37 Hubble telescope 37 Antarctic glacier 37 Carl Gustaf Lundin 37 southernmost continent 37 skin wrinkling 37 Zeebe 37 mammal extinctions 37 polar bears 37 harmful gases 37 megafauna extinction 37 Caspar Ammann 37 methane hydrates 37 methane clathrate 37 Carbon monoxide CO 37 Methyl bromide 37 delicate ecosystems 37 hair cuticle 37 atmospheric pollutants 37 deepwater corals 37 hydrosphere 37 climate modellers 37 habitable planet 37 Goldilocks planet 37 mutagens 37 hypoxic zone 37 pristine Drakes Estero 37 noctilucent clouds 37 galaxy formation 37 oxidized mercury 37 planet HD #b 37 climate alarmists 37 anthropogenic carbon dioxide 37 Quaternary Period 37 emissons 37 hoofed critters 37 ppm CO2 37 specular reflection 37 osmotic stress 37 soot particulates 37 Klekociuk 37 glacial ice 37 Flame retardants 37 carbon dioxide emissions 37 Carbon dioxide emissions 37 peatland 37 Acidification 37 GOSAT 37 harmful chemicals 37 Greenland Glaciers 37 seagrasses 37 SINFONI 37 fragile marine ecosystems 37 carbon dioxide CO2 emissions 37 #ppm [001] 37 laser irradiation 37 geomagnetic substorms 37 sulfur dioxide 37 periodic dimming 37 HFO #yf 37 corona discharge 37 particulate pollutants 37 Earth albedo 37 planetary atmospheres 37 axial tilt 37 CO2 emissions 37 nitrogen oxides emitted 37 endocrine disrupting chemicals EDCs 37 heat trapping gases 37 nitrous oxide emissions 37 isoprene 37 hurricanes Landsea 36 Carbon tetrachloride 36 Kyoto Protocols 36 species extinctions 36 HFCs perfluorocarbons PFCs 36 mucous secretions 36 ozone depleting refrigerants 36 neuro toxin 36 methane CH4 36 ionosphere 36 radiative 36 cosmic radiation 36 mangrove ecosystems 36 stellar occultation 36 R#a 36 reactive oxygen species 36 phagocytes inhibiting NADPH oxidase 36 greenhouse gas emissions 36 Klaus Toepfer Executive 36 Desertification 36 mid latitudes 36 meteorite impacts 36 Serreze 36 Medieval Warm Period 36 Anthropogenic Global Warming 36 glaciers melting 36 refrigerant leaks 36 comets asteroids 36 acidifying oceans 36 CO -2 36 chemtrail 36 receding glaciers 36 UVA rays 36 Amazonian rainforest 36 asteroid collisions 36 Aerosols 36 smoggy atmosphere 36 Environment Programme Unep 36 VOCs volatile organic compounds 36 Ayles Ice Shelf 36 HFC# 36 Tagish Lake meteorite 36 Boreal Forest 36 cosmic ray flux 36 sulfur isotope 36 harmful radiations 36 Ilulissat glacier 36 groundwater plume 36 tropical troposphere 36 Nitrous oxide 36 atmospheric nitrogen 36 anthropogenically 36 Fomalhaut b 36 photochemical reactions 36 Tunguska meteorite 36 ozone pollutant 36 wispy cirrus clouds 36 Dr Canadell 36 ultraviolet UV 36 soot particles 36 carcinogenic compounds 36 emmisions 36 glaciers retreating 36 laser resurfacing 36 Plate tectonics 36 Achim Steiner Executive 36 Antarctic Ozone 36 Alberta tarsands 36 Drusilla Hufford director 36 Melting glaciers 36 Ultraviolet UV radiation 36 HCFC #b 36 heat trapping emissions 36 alter nutrient absorption 36 dangerous anthropogenic interference 36 resource depletion 36 glacial meltwater 36 solar nebula 36 Coral reefs 36 HumiFilters 36 supernova explosions 36 skin elasticity 36 NuSTAR 36 Particulate Matter PM 36 geoengineering schemes 36 Gamma ray burst 36 walrus polar bears 36 Eyjafjallajokull Volcano 36 type 1a supernovae 36 suspected carcinogen 36 unburnt fuel 36 GJ #b [001] 36 Nitrogen dioxide 36 melting ice 36 SPICAM 36 sun ultraviolet UV 36 VOCs volatile 36 Environmental Programme UNEP 36 meteoroid 36 tropical peatlands 36 CO2 emmissions 36 fracing fluids 36 warmists 36 TrES 4 36 photodamage 36 Asbestos fibers 36 Hawking Radiation 36 harmful ultraviolet UV 36 insecticide DDT 36 albedo feedback 36 phytoplankton 36 noxious gasses 36 #.#C [004] 36 photosphere 36 Himalayan river basins 36 Siberian Traps 36 outgassing 36 carbonate minerals 36 moulins 36 Himalaya glaciers 36 Greenhouse Gases 36 matrix interferences 36 moon gravitational pull 36 AR Ravishankara 36 extremophile bacteria 36 carbondioxide emissions 36 interstellar clouds 36 Rignot 36 tropical glaciers 36 global warmists 36 coolants 36 gigatonnes 36 Otto Bliesner 36 anthropogenic aerosols 36 Laurentide Ice Sheet 36 thawing permafrost 36 aerosol concentrations 36 Warmer seas 36 UNEP Governing Council 36 ionizing 36 heat trapping greenhouse 36 Kilimanjaro glaciers 36 tropical coral reefs 36 mitochondrial function 36 Abdalati 36 Ozone Depleting 36 Particulates 36 Acrylamide 36 ice melts 36 Robert Bindschadler 36 climate forcings 36 carbonic acid 36 equatorial Pacific Ocean 36 Solar flares 36 sebaceous glands 36 Brenda Ekwurzel climate 35 wreak untold 35 Carbon Dioxide CO2 35 coronal loops 35 infra red radiation 35 atmospheric chemistry 35 rare wekiu bug 35 radioactively 35 Waleed Abdalati director 35 decadal scale 35 Korty reiterated 35 forests 35 magnetosphere 35 chytrid 35 Korty stressed 35 emitting greenhouse gases 35 Kyoto Protocol 35 PFCAs 35 metallicity 35 heat trapping greenhouse gas 35 anthropogenic 35 greenhouse gas HFC 35 NF3 35 earth 35 Snowball Earth 35 megafires 35 micrometeoroids 35 marine biodiversity 35 sulfur compounds 35 Saturn auroras 35 mold fungus 35 light separating spectrograph 35 sub glacial lakes 35 permafrost thaw 35 polar bear habitat 35 sulfuric acid mist 35 Mud volcanoes 35 carbonate globules 35 draining aquifers 35 bark beetle epidemic 35 microbial biofilms 35 Earthlike planet 35 stratospheric ozone chemistry 35 bromine compounds 35 noble gases 35 2oC 35 Fred Prata 35 arctic plains 35 sulfur hexafluoride SF6 35 oxidising 35 solar corona 35 electromagnetic radiation EMR 35 Ozone Layer Protection 35 GtC 35 pesticide DDT 35 carbon monoxide CO 35 longwave radiation 35 condensation nuclei 35 UV exposure 35 HD# [002] 35 Louis Camille Maillard 35 tropopause 35 honey bee populations 35 Type Ia supernovas 35 Climategate 35 pine beetle infestation 35 cyclopentane 35 cirrus clouds 35 Klaus Toepfer 35 clogging waterways 35 Overfishing pollution 35 Martian dunes 35 EVLA 35 poisonous gasses 35 Chicxulub 35 phytoplankton bloom 35 anthropogenic interference 35 Neutron stars 35 dioxide 35 sulfur dioxide pollution 35 jet contrails 35 KT boundary 35 UVB 35 Mercury flyby 35 orbited Jupiter 35 superoxides 35 Particulate emissions 35 coolings 35 emissions 35 airborne pollutants 35 emits X rays 35 peat swamp forests 35 dimming starlight 35 seabed sediments 35 spherical halo 35 accretion disks 35 GZK cutoff 35 nasal cilia 35 degrees Centigrade #.#F 35 chondrules 35 refrigerant leakage 35 tropical savanna 35 halogenated gases 35 Nitrogen trifluoride 35 Gliese #c 35 Foam insulation 35 clathrates 35 polar mesospheric clouds 35 Refrigerants Naturally 35 Tropical rainforests 35 hotter summers 35 atrazine herbicide 35 GHG emissions 35 thermal inertia 35 mercury 35 groundwater 35 ionizing radiation 35 melts Himalayan glaciers 35 hydrochlorofluorocarbons 35 climategate 35 atmospheric moisture 35 HABs 35 heme oxygenase 35 sheet Summerhayes 35 Esteemed Mullah sir 35 carcinogenic toxins 35 Sulphur dioxide 35 astrophysical 35 Sulfur dioxide 35 fainter objects 35 Lake Vostok 35 Cosmic Microwave Background 35 orangutan populations 35 sequesters carbon 35 absorbing carbon dioxide 35 cosmetic creams 35 oxidative damage 35 Heart Laser RenalGuard 35 Eemian 35 infalling gas 35 Reactive oxygen species 35 Permafrost 35 methane burps 35 solvent vapors 35 planetary 35 streambanks 35 single celled microorganisms 35 permafrost melting 35 harmful UV rays 35 soot emitted 35 Microlensing 35 forest ecosystems 35 Medieval Warming Period 35 nitrous oxides 35 epidermis 35 boreal regions 35 Mandushev 35 soil fertility 35 pine beetles 35 #ppm CO2 35 hydrogen sulphide H2S 35 climatic variability 35 Stefan Rahmstorf 35 fibroid tissue 35 Konrad Steffen 35 ionized particles 35 alone Reheis Boyd 35 Permian extinction 35 Oxidative stress 35 orbiting telescope 35 dehumidifying 35 Clogged filters 35 lung irritant 35 peatland forests 35 Kyoto Accords 35 Hydrogen Cyanide 35 orang utan habitats 35 Scambos 35 Tunguska explosion 35 potent neurotoxin 35 Emilie Moorhouse 35 automobile tailpipes 35 SF6 35 Arctic Ocean 35 alpha particle 35 acrylamide formation 35 hormone disruptors 35 vapor 35 flame retardants 35 moon Europa 35 carbon monoxide nitrogen dioxide 35 hydrofluorocarbons HFCs perfluorocarbons PFCs 35 CO2 CH4 35 supervolcanoes 35 Supermassive black 35 vapourise 35 volcanic plumes 35 Paul Crutzen 35 asteroidal 35 Little Ice Age 35 Corot 7b 35 Sunshield 35 fluorotelomers 35 mankind 35 Sulfuryl fluoride 35 peroxynitrite 35 Arctic oscillation 35 dissolving coral reefs 35 asteroid 35 cosmic microwave background 35 perfluorinated compounds PFCs 35 Methylmercury 35 cosmic gamma rays 35 Earthlike planets 35 heatwaves droughts 35 Gabriel Vecchi 35 climategate controversy 35 cow burps 34 cometary debris 34 author Ken Caldeira 34 ° C warmer 34 oxidization 34 Hubble Space Telescope HST 34 cyclonic storms 34 Himalayan glacier 34 peat bogs 34 Earth thermosphere 34 condensation 34 Muggiati 34 p# pathway 34 Amazon Rainforest 34 Mount Pinatubo eruption 34 Ocean Acidification 34 Mercury magnetosphere 34 amplifying feedbacks 34 climate modeller 34 photocatalysis 34 CarbonTracker 34 CFC refrigerants 34 myelin sheaths 34 juglone 34 teleconnections 34 Sheila Watt Cloutier 34 ethylmercury 34 climate 34 CryoSat satellite 34 Envisat satellite 34 planetary Transits 34 orbiting observatories 34 fossil fuels 34 KT extinction 34 Wallace Broecker 34 Friis Christensen 34 Mercury exosphere 34 Paraquat 34 golden toad 34 Volker Liebig 34 polar stratospheric 34 noxious pollutants 34 hydrogen sulfide H2S 34 cosmic ray intensity 34 gaseous methane 34 distant supernovas 34 groundwater depletion 34 Kepler #b 34 biogeochemical cycling 34 zinc oxide nanoparticles 34 XMM Newton 34 driest continents 34 oxidative stresses 34 ultraviolet light 34 interstellar medium 34 Brigham Grette 34 carbon dioxides 34 Particulate pollution 34 tropical forest 34 cryoprotectants 34 seawater pH 34 seafloor sediments 34 meek inheriting 34 Greenland Antarctica 34 bacterial decomposition 34 Columbia insulating tiles 34 chlorine disinfectants 34 Great Conveyor Belt 34 Elemental mercury 34 Svensmark 34 Hubble Telescope 34 carbon emissions 34 dimethyl sulphide 34 soot smog 34 Martian permafrost 34 Younger Dryas 34 flood basalts 34 aerosol sprays 34 PFOS 34 Dr Maria Neira 34 ocean basins 34 Maryam Golnaraghi 34 oxidise 34 Tropical deforestation 34 microplastics 34 acrolein 34 supernova explosion 34 reactive oxygen species ROS 34 shadowed craters 34 saline aquifer 34 ionized gases 34 Mojzsis 34 Siple Dome 34 organochlorine pesticides