Related by context. All words. (Click for frequent words.) 67 Himalayan glacier 64 glaciers 64 Himalayan Glaciers 60 glacial melting 59 mountain glaciers 59 melting Himalayan glaciers 58 glacial melt 58 Himalayan glaciers melting 57 Himalaya glaciers 57 alpine glaciers 56 Gangotri glacier 55 Glaciers 55 melting glaciers 55 Alpine glaciers 54 glacier melt 54 glaciologists 54 IPCC 53 glacier melting 53 Greenland icesheet 53 glacier 53 Climate Change IPCC 52 Antarctic glaciers 52 receding glaciers 52 Greenland ice 52 Greenland glaciers 52 Himalayan glacier melt 51 Dr Pachauri 51 Kilimanjaro glaciers 51 UN Intergovernmental Panel 51 Glaciergate 50 glaciers melting 49 Himalayas 49 Melting glaciers 49 glacial retreat 49 Pachauri 49 shrinking glaciers 49 Intergovernmental Panel 48 Konrad Steffen 48 disappearing glaciers 48 Rignot 48 Intergovernment Panel 48 melt Himalayan glaciers 48 polar ice 48 glaciers melt 47 Syed Iqbal Hasnain 47 meltwater 47 Andreas Schild 47 species extinctions 46 Arctic icecap 46 glacial lake 46 tropical glaciers 46 Tibetan Plateau 46 icecap 46 Kolahoi 46 polar icecaps 46 glaciers retreating 46 Laurentide Ice Sheet 45 Antarctic ice 45 anthropogenic emissions 45 icesheet 45 Rahmstorf 45 chairman Rajendra Pachauri 45 subglacial lakes 45 Pielke 45 Greenland Ice 45 glacier shrinkage 45 NSIDC 45 melting ice 45 Tibetan plateau 44 Gangotri Glacier 44 Service WGMS 44 hydrological cycle 44 glaciologist 44 Gangetic dolphins 44 scientist Jay Zwally 44 Biodiversity TEEB 44 gigatonnes 44 climate modellers 44 climate modelers 44 Inter Governmental Panel 44 Eric Rignot 44 GLOF 44 IPCC Intergovernmental Panel 44 Mount Kilimanjaro glaciers 44 Climategate scandal 44 AR4 43 outlet glaciers 43 icesheets 43 polar caps 43 Qinghai Tibet plateau 43 atmospheric CO2 43 Syed Hasnain 43 Siachen glacier 43 mountain snowpacks 43 Amazonian forests 43 Greenland icecap 43 oceans 43 atmospheric methane 43 authoritative Intergovernmental Panel 43 Glaciologists 43 retreating glaciers 43 Amstrup 43 Climate Change IPPC 43 cryosphere 43 IPCC AR4 43 Arctic Ocean 43 anthropogenic climate 43 Jakobshavn Isbrae 43 Climategate emails 43 Ted Scambos 43 glacial shrinkage 43 polar icecap 43 manmade global warming 43 Glacier Monitoring 43 glacial lakes 42 Laurentide ice sheet 42 Holocene epoch 42 atmospheric carbon dioxide 42 Climatic Research Unit 42 Amazon rainforests 42 snowcaps 42 glaciers melted 42 severe droughts 42 Antarctic Ice 42 GISS analysis 42 drylands 42 climatologists 42 IPCC Rajendra Pachauri 42 Skeptical Environmentalist 42 environmentalist Sunita Narain 42 Serreze 42 Pachauri IPCC 42 Abdalati 42 melting permafrost 42 polar oceans 42 Benjamin Santer 42 Climate Impact Assessment 42 Hesperian Epoch 42 Qinghai Tibetan plateau 42 Jakobshavn 42 Himalayan river basins 41 Norphel 41 Mojib Latif 41 sub glacial lakes 41 Professor Beddington 41 Hamish Pritchard 41 Millennium Ecosystem Assessment 41 Climate alarmists 41 amphibian declines 41 Corinne Le Quere 41 Climatic Research Unit CRU 41 melting glacier 41 Little Ice Age 41 ICIMOD 41 economist Amartya Sen 41 glacier melts 41 Melting Glaciers 41 icecaps 41 glacial ice 41 megafauna 41 interglacial period 41 ocean acidification 41 Arctic permafrost 41 VK Raina 41 anthropogenic greenhouse gases 41 glaciers recede 41 ocean acidity 41 glacial meltwater 41 Corinne Le Quéré 41 Quaternary Period 41 sheet Summerhayes 41 Siachen Glacier 41 Snowball Earth 41 climategate scandal 41 anthropogenic warming 41 deglaciation 41 journal Climatic Change 41 atmospheric CO2 levels 41 Last Glacial Maximum 41 Aiguo Dai 41 glacier retreat 41 Thorthormi 40 Luterbacher 40 Velicogna 40 Glacial melt 40 Population Prospects 40 Indus Ganges 40 Zeebe 40 peatland 40 Indus basin 40 storied snows 40 Trenberth 40 Amazon rainforest 40 Jakobshavn Glacier 40 pikas 40 Himalayan Geology 40 Tropical Meteorology IITM Pune 40 Murari Lal 40 Patagonian glaciers 40 waterbird species 40 Greenhouse Gas Bulletin 40 Luthcke 40 glacier calving 40 climategate affair 40 ecological degradation 40 Helheim Glacier 40 TEEB 40 Greenland 40 amphibian species 40 Amundsen Sea Embayment 40 Warmer oceans 40 Schellnhuber 40 Antarctic Peninsula 40 CRU emails 40 Ocean acidification 40 greenhouse warming 40 Hongbin Qu chief 40 journal Meteoritics 40 journal Nature Geoscience 40 Diporeia 40 amphibian populations 40 Deccan Traps 40 dubbed Climategate 40 Biodiversity Outlook 40 Management Institute IWMI 40 ozone layer depletion 40 terrestrial ecosystems 40 melting Arctic 40 Pacific walruses 40 Planetary Change 40 Scambos 40 Roger Pielke Sr. 40 mammal extinctions 39 Warming temperatures 39 climate change 39 Andean glaciers 39 Toba eruption 39 polar bears 39 Prof. Prahalad 39 Antarctic Ice Shelf 39 Aletsch 39 melts Himalayan glaciers 39 TERI 39 glaciers retreated 39 Siachen 39 Sumatra Andaman earthquake 39 polar bear populations 39 Gaumukh 39 Crutzen 39 warmer wetter winters 39 Chenab river 39 Julienne Stroeve 39 Greenland Antarctica 39 Amundsen Sea 39 Gerald Meehl 39 Vatnajökull 39 Hindu Kush Himalayan 39 UR Rao 39 subglacial 39 Lake Turkana 39 CO2 concentrations 39 Chukchi Sea 39 anthropogenic CO2 emissions 39 decadal scale 39 Rajendra Pachauri 39 Jevrejeva 39 river deltas 39 atmospheric circulation 39 WMO 39 Cryogenian 39 Aletsch glacier 39 Bjorn Lomborg author 39 Sugata Hazra 39 Indian climatologist Rajendra 39 Mountain Development ICIMOD 39 Global warming 39 Greenland glacier 39 volcanic plumes 38 fabled Northwest Passage 38 waterbird populations 38 Omo River 38 Arctic 38 protective ozone layer 38 Pareechu 38 NCMRWF 38 ocean basins 38 World Meteorological Organisation 38 tropical forests 38 Prof Beddington 38 Brahamaputra basins 38 climategate emails 38 Lindzen 38 manmade CO2 emissions 38 journal Geophysical Research 38 Bette Otto Bliesner 38 Robert Bindschadler 38 Tehri dam 38 global warming alarmists 38 Antarctica 38 biodiversity 38 tigers roamed 38 Zoological Survey 38 permafrost 38 negotiator Shyam Saran 38 Joan Kleypas 38 coral reefs 38 mangrove forests 38 climatic variability 38 AGW hypothesis 38 Arunachal Pradesh 38 Yangtze finless porpoise 38 Wilkins Ice Shelf 38 RealClimate 38 paleoclimate 38 permafrost thaws 38 climategate controversy 38 Report AR4 38 Climatic Change 38 Glaciers melting 38 Baglihar dam 38 global warming skeptics 38 extinctions 38 Nature Geosciences 38 Mark Serreze 38 Polar Bear Specialist 38 Climategate e mails 38 Laveesh Bhandari 38 hotter drier summers 38 Neil Adger 38 Walt Meier 38 Kevin Trenberth 38 moulins 38 Suresh Tendulkar 38 Boris Worm 38 Chief Executive Jasmine Whitbread 38 melting 38 floods droughts 38 warmists 38 AIDS Epidemic Update 38 Rajendra Kumar Pachauri 38 Prodipto Ghosh 38 Ozone layer 38 subsurface ocean 38 climategate 38 Friis Christensen 38 Petoukhov 38 ° C warmer 37 decadal 37 climate alarmists 37 AGW theory 37 lodgepole pine forests 37 #.#C warmer 37 melting icebergs 37 Biogeography 37 chairman climatologist Rajendra 37 Yangtze basin 37 pika populations 37 Development IAASTD 37 warmings 37 marine biodiversity 37 RK Pachauri 37 scientist Rajendra Pachauri 37 Himalaya Mountains 37 Govindasamy Bala 37 Tropical Meteorology Pune 37 Ilulissat glacier 37 Climate Change Rajendra Pachauri 37 heatwaves droughts 37 carbon dioxide concentrations 37 golden toad 37 hydrologic cycle 37 warmer winters 37 Keeling Curve 37 tropical coral reefs 37 Medieval Warming Period 37 heatwaves floods droughts 37 kept mountainous snowbanks 37 Michel Jarraud secretary 37 Nature Geoscience 37 seamounts 37 peat bogs 37 Greenland Glaciers 37 global warming 37 Climate Prediction 37 Western Ghats 37 Jay Zwally 37 Chacaltaya glacier 37 acidic oceans 37 Alaskan glaciers 37 #.#-#.# degrees Fahrenheit [002] 37 caribou herds 37 mountain snowpack 37 Otto Bliesner 37 Geophysical Research 37 mangrove ecosystems 37 Iqbal Hasnain 37 thawing permafrost 37 Bering Glacier 37 ice lingam 37 Coral reefs 37 ecosystems 37 subalpine 37 Polar Biology 37 springtime ozone 37 Shasta glaciers 37 biodiversity hotspots 37 melt glaciers 37 Paleocene Eocene Thermal Maximum 37 Tropical deforestation 37 UNAIDS WHO 37 Aral Sea 37 ClimateGate scandal 37 Droughts 37 Siachin 37 Climate Warming 37 Climategate 37 geological timescale 37 atmospheric CO2 concentration 37 Jellyfish swarm northward 37 mass extinction 37 Siberian permafrost 37 Medieval Warming 37 tidewater glaciers 37 NC Saxena 37 lowland forests 37 Dhauladhar range 37 aquatic ecosystems 37 anthropogenic global warming 37 aspen groves 37 Medieval Warm Period 37 lake sediments 37 carbon fluxes 37 ecological overshoot 37 ghg emissions 37 journal Palaios 37 Unep 37 C# atmospheric concentrations 37 snowline 36 amphipods 36 erratic monsoons 36 plate tectonics 36 Impacts Adaptation 36 melting icecaps 36 rampant deforestation 36 Institute TERI 36 Prof CNR Rao 36 John Beddington 36 Martin Sommerkorn 36 Medieval Warm Period MWP 36 Antarctic ozone 36 Terre Adelie 36 Threats Challenges 36 Schladow 36 densely forested mountains 36 primeval forests 36 river basins 36 Global Amphibian Assessment 36 UKERC 36 Robert Corell 36 Kangerdlugssuaq 36 Isabella Velicogna 36 Shrinking glaciers 36 ribbon seals 36 Roger Pielke 36 KT boundary 36 Simone Tilmes 36 Nisqually Glacier 36 Ayles Ice Shelf 36 Lomborg 36 anthropogenically 36 Himalayan Glaciology 36 Plimer 36 megafauna extinction 36 Bjorn Lomborg 36 peat swamps 36 anthropogenic greenhouse gas 36 coral species 36 reactive nitrogen 36 Richard Lindzen 36 crustal movements 36 melting glacial 36 Dr. RK Pachauri 36 Dr Rajendra Pachauri 36 Amazonian rainforest 36 Alpine glacier 36 Arvind Virmani 36 Batalik sector 36 southernmost continent 36 subtropical regions 36 Martian volcanoes 36 ocean ecosystems 36 Cretaceous Tertiary KT 36 Wilfried Haeberli 36 towering icebergs 36 desertification 36 undersea plumes 36 evergreen forests 36 deforestation 36 Andean snowmelt 36 orangutan habitat 36 missing baryons 36 hotter summers 36 Nepalese Himalayas 36 Martian gullies 36 narwhal 36 IWMI 36 Aksai Chin 36 greenhouse gas concentrations 36 Catlin Arctic 36 Copenhagen Diagnosis 36 World Meteorological Organization 36 Ice Age glaciers 36 carbon sinks 36 Andaman Nicobar islands 36 wolverine habitat 36 Weddell Sea 36 Pathak Inquiry Authority 36 Qinghai Tibetan Plateau 36 midlatitudes 36 Khumbu glacier 36 Shivaliks 36 polar regions 36 methane hydrate deposits 36 Venusian atmosphere 36 grasslands 36 Joachim von Braun 36 Fissile Materials 36 Valmik Thapar 36 droughts heatwaves floods 36 Climate Change Impacts 36 whitebark pines 36 Peary caribou 36 mountaintop glaciers 36 Indo Gangetic plains 36 Coral bleaching 36 stratospheric ozone 36 Georg Kaser 36 boreal regions 36 glacial 36 moon gravitational pull 36 marine ecosystems 36 underground aqueducts 36 Climate Change 36 Eemian 36 deepwater corals 36 Siple Dome 36 Svensmark 36 Great Aletsch Glacier 36 snowcap 36 pika habitat 36 Hans von Storch 36 Heaviest snowfall 36 reef habitats 36 Molnia 36 thermal inertia 36 Christian Marcussen 36 mammal species 36 Anthropogenic Global Warming 36 Nilgiri Tahr 36 Josefino Comiso 36 Ken Kochanek CDC 36 climate alarmism 36 cablegate archive 36 ClimateGate 35 acidification 35 heatwaves floods 35 Palaeocene Eocene Thermal Maximum 35 Ladakh region 35 El Nino periodic 35 icefields 35 tropical deforestation 35 Qinghai Tibet Plateau 35 Rupa Kumar Kolli 35 Ted Scambos glaciologist 35 GtC 35 equatorial Pacific Ocean 35 Sarasvati 35 Himalaya Karakoram 35 gigatonne 35 meteorite impacts 35 Himalayan mountains 35 Vatnajokull 35 Retreating glaciers 35 Skeptical Environmentalist Guide 35 sealevel 35 deep convective clouds 35 James Lovelock 35 Paola Lagorio president 35 Alpine ski resorts 35 Sceptical Environmentalist 35 GHG concentrations 35 Fagre 35 surface temperatures SSTs 35 western ghats 35 International Geosphere Biosphere 35 Allander Institute 35 AMAP assessment 35 Environment Programme Unep 35 Ozone Hole 35 frequent droughts 35 anthropogenic 35 Agriculture Organisation 35 Roger Bilham 35 SLMM 35 amplifying feedbacks 35 Oetzi 35 Larsemann Hills 35 sediments deposited 35 glaciation 35 Mridula Mukherjee 35 upwellings 35 Paleoclimate 35 ppmv 35 Ken Caldeira 35 Aksai Chin plateau 35 ocean ridges 35 Tsangpo 35 Baglihar 35 Gigatonnes 35 seals walrus 35 retreating glacier 35 Deccan plateau 35 peatlands 35 Lake Balkhash 35 biodiversity hotspot 35 Global Biogeochemical Cycles 35 tropical troposphere 35 volcanic plume 35 Deccan Plateau 35 Sermeq Kujalleq 35 nitrogen deposition 35 glacial earthquakes 35 Francesca Grifo 35 journal Oryx 35 Jon Ove Hagen 35 Wadden Sea 35 eruptive activity 35 freshwater 35 Mars Squyres 35 lithosphere 35 Agriculture Organization 35 Tony Del Genio 35 Christian Nellemann 35 plankton 35 albedo 35 deltaic 35 Kolahoi glacier 35 Hongbin Qu 35 Easy Tec 35 supervolcanoes 35 Dr RK Pachauri 35 degree Centigrade 35 Tropical Meteorology IITM 35 coral bleaching 35 Neukum 35 cyclonic storms 35 Martian meteorites 35 Environment CSE 35 Goverdhan Mehta 35 Jarraud 35 Grímsvötn 35 IFPRI 35 transboundary waters 35 Lake Untersee 35 paleomagnetic 35 science journal Nature 35 Ghats 35 Puijila 35 melts glaciers 35 mantle plumes 35 Glaciers Melting 35 Agricultural Organization FAO 35 #.#C [004] 35 reindeer herds 35 Younger Dryas 35 Climate Change IPCC Rajendra 35 Bali roadmap 35 atmospheric ozone 35 Gomukh 35 narrow ravines 35 coastal inundation 35 Gerald Meehl senior 35 Madhav Chitale 35 Changing Climate 35 Acidification 35 droughts floods heatwaves 35 icefield 35 Eyjafjallajökull eruption 35 deepest freshwater 35 palaeoclimate 35 Eastern Ghats 35 Dr Canadell 35 Indus Basin 35 Capricorn Glacier 35 ALH# 35 West Antarctic icesheet 35 rigorously peer reviewed 35 Imja 35 Khumbu Glacier 35 Baglihar project 35 rivers 35 Arctic tundra 35 Boreal forests 35 Appy Sluijs 35 woodland caribou 35 Columbia Icefield 35 lunar crust 35 Global Warming 35 Prolonged droughts 35 temperate forests 35 Pep Canadell 35 Mount Pinatubo 35 Revkin 34 Deforestation 34 Jonathan Overpeck 34 Younger Dryas cold 34 moon permanently shadowed 34 M. Rajeevan 34 Chacaltaya 34 NIPCC 34 Earth ozone layer 34 Met Office 34 anthropogenic aerosols 34 Narlikar 34 climatic variations 34 earths 34 Soufriere Hills Volcano 34 Warmer seas 34 poleward shift 34 forecaster Barry Gromett 34 Greenhouse gases 34 Raffaele Bendandi 34 Quelccaya ice cap 34 Helheim 34 Grinnell Glacier 34 heat trapping carbon dioxide 34 Drugs ACMD 34 Justice Liberhan 34 Mhadei 34 Research Institute IFPRI 34 Lake Yoa 34 Chittagong Hill Tracts 34 journal Ethology 34 #-#.# degrees Fahrenheit 34 Protectionist pressures 34 Achim Steiner Executive 34 Woolly mammoths 34 anthropogenic carbon dioxide 34 Scott Luthcke 34 heathlands 34 Kangchenjunga 34 megadroughts 34 East Anglia Climate 34 Prof. Amartya Sen 34 IAASTD 34 warmist 34 Isle Royale wolves 34 Sheet WAIS 34 Uttarkashi 34 global weirding 34 manmade greenhouse gases 34 Matherani 34 Steven Amstrup 34 floods heatwaves droughts 34 Niyamgiri 34 Paal Prestrud 34 Severe droughts 34 consultancy Ecofys 34 9NEWS Meteorologist Ashton Altieri 34 snow melt 34 explorer Pen Hadow 34 permafrost melts 34 WG2 34 glacial cycles 34 halogenated gases 34 troposphere 34 Adelie penguins 34 Kalapani 34 UNFCCC 34 Population Bomb 34 snowmelts 34 Gangetic plains 34 Baglihar Dam 34 continental drift 34 Kevin Trenberth climate 34 Chilika Lake 34 Professor Plimer 34 Overgrazing 34 peer reviewed scientific 34 Arunachal 34 receding glacier 34 melting polar 34 undiscovered technically recoverable 34 disputed isles 34 gigatons 34 oceanic circulation 34 Atlantic thermohaline circulation 34 isostatic rebound 34 Di Aping 34 Bjørn Lomborg 34 Anthropocene 34 molten magma 34 Roger Pielke Jr. 34 MS Ananth 34 cypress forest 34 Cumbre Vieja 34 Himalayan 34 Yarlung Tsangpo 34 underwater Lomonosov Ridge 34 Katharine Willett 34 Shakhova 34 penguin colonies 34 CryoSat mission 34 MeT department 34 fearsome Tyrannosaurus rex 34 Worldwatch 34 Guha Sapir 34 Lt Gen Prakash 34 MoEF 34 Greenland glaciers melt 34 biota 34 aspen forests 34 Centre UNEP WCMC 34 Sunita Narain 34 Mount Nyamulagira 34 journal Geology 34 Indus Waters Treaty 34 Permian extinction 34 Yangtze River Basin 34 reef ecosystems 34 Quelccaya 34 wolverines 34 Maoist combatants 34 Hoeppe 34 authors Kevin Trenberth 34 interglacial 34 abyssal plains 34 Tad Pfeffer 34 Earth albedo 34 Nature Geoscience journal 34 lichens 34 Yvo de Boer 34 km3 34 mass extinctions 34 Buddhist stupas 34 markhor 34 Eric Steig 34 Cryospheric Sciences Branch 34 equatorial regions 34 Simcyp Limited 34 Waleed Abdalati director 34 Climate Change Reconsidered 34 Meili Snow 34 Desertification 34 Seagrasses 34 teleconnections 34 seagrasses 34 worsening droughts 34 G8 communiqué 34 degree centigrade 34 Quamrul Islam Chowdhury 34 tarns 34 Scheraga 34 freshwater ecosystems 34 meteor impacts 34 East Anglia CRU 34 #.#C [002] 34 forcings 34 Mohan Munasinghe 34 BN Goswami 34 Himalayan region 34 Kanchenjunga 34 Holdren physicist 34 coccolithophores 34 chytrid 34 Liberhan 34 Cloudiness 34 clogging waterways 34 Devastating floods 34 glaciations 34 Sheldon Drobot 34 Sutlej river 34 Eyjafjoell volcano 34 Heavier rainfall 34 Saturn moon Mimas 34 Camilla Toulmin 34 IPCC TAR 34 waterfowl habitats 34 Klaus Toepfer Executive 34 multi decadal 34 Internationally EDC 34 polar bear habitat 34 NCAR scientist Synte Peacock 34 IUCN 34 Le Quéré 34 glaciated 34 Ilulissat 33 Karakoram 33 NSA MK Narayanan 33 WEO 33 Anthropogenic 33 alpine ecosystems 33 Pugwash Conferences 33 Abrupt Climate Change 33 President Anote Tong 33 taiga forest 33 biosphere 33 S. Lindzen 33 scenic Himalayan 33 cosmic ray flux 33 Romero Lankao 33 peat lands 33 Director Bakul Dholakia 33 Deluges 33 Cardamom Mountains 33 Marika Holland 33 Budgetary Questions ACABQ 33 Council GWEC 33 Inuits 33 Indian Ocean Dipole 33 glaciology 33 swirling dust devils 33 D' Espagnat 33 Earth Overshoot Day 33 Unctad 33 penguin breeding 33 fissure eruption 33 geoid 33 geophysicist Scott Luthcke 33 habitats 33 Nolan Doesken 33 Bharat Karnad 33 mid Pliocene 33 Chukchi seas 33 Avoiding Dangerous Climate Change 33 paleoclimatic 33 Fram Strait 33 shadowed craters 33 Ron O'Dor 33 blanket bog 33 snowpacks 33 melting snows 33 virgin forests 33 heat trapping greenhouse gas 33 anomalously warm 33 Stratospheric ozone 33 Hadow 33 Julia Marton Lefèvre 33 Chasma Boreale 33 bowhead whales 33 Geoengineering 33 supercomputer simulations 33 Venkataraman Ramakrishnan 33 Saturn moon Enceladus 33 biodiverse ecosystems 33 past boninite lavas 33 #.#C #.#C 33 trillionth tonne 33 Climate Impact 33 Climate Change UNFCC 33 Nate Mantua 33 Solar Terrestrial Physics 33 Ainun Nishat 33 megadrought 33 IIGEP 33 Hindukush 33 global warming alarmism 33 Bruce Jakosky 33 megafaunal 33 Gao Guangsheng 33 dinosaur extinction 33 paleoenvironmental 33 floods heatwaves 33 Manoranjan Mohanty 33 subduction zones 33 Natalie Mahowald 33 Antarctic peninsula 33 seagrass meadows 33 ozone layer 33 Climate Change Secretariat 33 equatorial Pacific oceans 33 Petermann glacier 33 UCPN M 33 Jane Ferrigno 33 Opposes drilling 33 phytoplankton biomass 33 faunas 33 Gangetic 33 Carbon dioxide emissions 33 inundate coastal 33 droughts heatwaves 33 Danish statistician 33 mid latitudes 33 coastal wetlands 33 Patagonian Andes 33 Glaciology 33 aerosol concentrations 33 Julia Slingo 33 floods droughts heatwaves