['planets universe', 'one know support life', 'right distance sun perfect climate', 'lts called lucky planet', 'five billion years ago huge asteroid crashed earth', 'tilting angle exactly half degrees sun', 'cataclysmic accident turned nothing short miracle', 'without crucial tilt', 'everything would different', 'created seasons extremes climate hot cold', 'landscapes spectacular beauty', 'perfect conditions life earth', 'life earth built chance powered sun', 'delicate balances world faltering', 'planet struggles support growing demands', 'time take stock stand lose', 'follow year earth', 'joining fellow creatures battle raise young', 'world rapidly changing', 'january high arctic', 'sun month', 'time year permanent night', 'male polar bears winter patrol little eat', 'bear grunting', 'every living thing waiting', 'february', 'sun makes first appearance horizon', 'female bear underground den whole winter', 'toboggans slope', 'perhaps clean fur', 'looks like sheer joy', 'hasnt alone', 'cubs born underground', 'mewling', 'theyre two months old', 'first time theyve seen light day', 'mewling', 'soft grunts', 'mewling', 'theyre drawn mothers calls', 'slopes easiest place take first steps', 'mewling', 'cubs havent fed morning', 'mother delayed first meal special day', 'hunger draw', 'lts beginning training', 'milk food cubs known', 'since born deaf blind beneath snow', 'mother hasnt eaten five months', 'lost half body weight', 'shes giving last reserves cubs', 'cant leave yet search food', 'shes trapped slopes cubs find feet', 'lts trial female bears always endured', 'every year time female bears need food desperately', 'know must get hunting grounds ice', 'cant know theres problem waiting', 'new problem', 'planet warming sea ice melting earlier every year', 'place bears hunt seals', 'lf dont make ice breaks', 'families starve', 'far year ice holds firm', 'firm enough support male polar bear father cubs', 'searches prey', 'wont help female', 'lnstinct makes fend alone', 'ten days later', 'starving mother trying lead young sea ice', 'theyve found feet', 'still dont share sense urgency', 'soft barks', 'mewling', 'mewling', 'last everyone seems ready journey', 'may already late', 'cracking sounds', 'miles coast ice already breaking unp', 'leading increasingly dangerous new world', 'lts unlikely cubs survive first year ice', 'cracking sounds', 'cracking sounds', 'march munch north remains snowbound', 'thousand miles south bears', 'stunted conifers still locked ice', 'mark tree line planet start taiga forest', 'vast belt trees forms almost unbroken circle around north globe', 'lts one last great wildernesses', 'conifers needleshaped leaves', 'virtually inedible', 'forest supports little animal life', 'ln silent world snow rarely marred footprints', 'live hard glimpse theyre like spirits', 'lynx roams hundreds miles search prey', 'lt may never visit patch forest twice', 'creature essence wilderness', 'many trees worlds rain forests combined', 'one third trees earth', 'spring creeps south taiga unveiled', 'lts forest produces munch oxygen', 'refreshes atmosphere entire planet', 'april life starts returning far north', 'visitors flock planet', 'theyve come make brief flush spring food', 'young', 'ln changing world', 'every new generation precious', 'playful growling', 'caribou travel north following form', 'three million vast herds crossing tundra', 'herds travel two thousand miles every year', 'search fresh pasture', 'lts longest overland migration earth', 'totally dependant vast open spaces', 'constantly move', 'lf newborn calves keep', 'must feet running day theyre born', 'vast herds dont travel alone', 'wolves shadow along way theyre hungry', 'first attack seems casual random', 'running herd tactic generate panic', 'ln chaos young separated mothers', 'easier target individual calf', 'calf may young capable outrunning wolf', 'manages keep footing', 'stage odds even', 'either caribou make mistake', 'mile wolf give unp', 'april arctic already sun never sets', 'south sun works magic gradual familiar ways', 'birdsong', 'birdsong', 'forests know well', 'broadleaf woodlands europe north america', 'crowded towns farmland', 'fragments remain', 'birdsong', 'summers longer deciduous trees flourish', 'theyre far edible conifers', 'forests bustle life', 'spring also come early mandarin ducks', 'female leaving nest high treetops', 'lts job lead way', 'lts long way maiden flight', 'quacks', 'calls encouragement needed', 'still two missing', 'two days old already one great adventure behind', 'rest year hold planets latest recruits', 'legacy weve inherited', 'thanks allimportant tilt earths axis', 'rhythm seasons', 'transformations world year year', 'seasonal cycle seems increasingly unreliable', 'parts world seasons', 'may tropics spring', 'sun shines hours day every day year', 'allows jungle grow unchecked', 'support munch life', 'rainforest covers third area', 'mere planets surface', 'yet contains half plants animals earth', 'bird animal calls', 'bird animal calls', 'rain forests new guinea especially precious', 'home different kinds birds paradise', 'extraordinary last', 'cawing', 'squeaking echoes', 'cawing', 'cawing', 'particularly rich forest', 'sixplumed bird paradise problem finding food', 'concentrate important tasks', 'like tidying display area', 'hes obsessed housework', 'everything spick span', 'finally stage set', 'lts virtuoso performance', 'unfortunately noone watching', 'cawing', 'contender called superb bird paradise', 'magician special trick', 'first advertises show', 'calling attract female', 'audience place', 'show begin', 'impressed', 'retires little way consider verdict', 'effort still doubts', 'cant help feeling deflated even best wasnt good enough', 'planet plants animals', 'nowhere stake', 'tropical forests enjoy hours sunshine year round', 'also need lots rainfall', 'weather patterns change already signs', 'forests starting dry', 'howling wind', 'deserts cover one third lands surface planet earth', 'theyre getting bigger every year', 'land survive', 'special', 'challenges becoming greater ever', 'june kalahari desert southern africa', 'trumpeting', 'lts dry season', 'thousands elephants started desperate trek food water', 'using ancient routeways handed generations', 'making way okavango', 'vast inland delta heart desert', 'moment dry water come', 'buffalo join great trek', 'across southern africa millions animals move', 'life death quest water', 'tiny calf struggles keep unp', 'lts mothers instinct care', 'need water desperate', 'may forced leave behind', 'dust storms make going tough way', 'trumpeting', 'theyve become separated herd', 'dangerous place lose way', 'theres sanctuary miles ahead small patch woodland', 'darent rest reach', 'rest herd escaped storm', 'would risk waited mother calf', 'finally stragglers emerge dust', 'blinded sand calf barely strength go', 'storm died', 'animals lucky', 'one youngster got lost', 'thirsty exhausted follows tracks mother wrong direction', 'dust meets water march deserts halted', 'sand dunes give way prairies savannah', 'grass great unsung hero planet', 'lt keeps deserts check fuels many earths great spectacles', 'great game herds east africa rely one miraculous plant', 'every day wide open plains world', 'timeless ritual plays', 'drama hunter hunted', 'circle life us urban lives lost touch', 'elephants marching two weeks', 'little calf mother caught herd', 'theyre desperately thirsty', 'perhaps spurred memory past', 'matriarch leads herd temporary water hole', 'one may saved life years ago', 'elephants share water others', 'uneasy alliances', 'growls', 'trumpeting', 'growling', 'day elephants dominate water hole', 'thunder', 'ln night time balance power shifts', 'trumpeting', 'calf mother risk', 'theyre closer lions know', 'elephant growls', 'ln darkness elephants vision little better', 'lions see easily', 'elephant growls', 'lions growl', 'trumpets', 'cats ravenously hungry', 'elephants sense danger', 'elephant growls', 'trumpeting', 'elephant growls', 'lions bide time', 'lts calves theyre', 'elephant growls', 'squealing growling', 'lions growling', 'lions rally elephants herd young together', 'forming protective circle keep away predators', 'cats find opening defensive wall hide', 'elephants growl', 'lion growls', 'trumpeting', 'growls', 'growling', 'lions growling', 'calves well protected', 'lions take risk change tactics', 'normally solitary lion would stand chance elephant', 'whole pride', 'theyre specialist elephant hunters', 'elephant growls', 'elephant growls', 'elephant squeals', 'thunderclap', 'survivors okavango delta still many miles away', 'deserts grow traditional migration routes blocked farms fences', 'elephants must trek ever greater distances', 'sun scorches desert also brings water land', 'beats tropical seas', 'moisture rises warming oceans powering global weather system', 'moist winds indian oceans sweep north towards himalayas', 'air rises cools water falls snow', 'scene set one natures challenging migrations', 'year thousands demoiselle cranes try escape harsh winters mongolia', 'flying south warmer climes lndia', 'get cross highest mountain range earth', 'himalayas', 'sun heats great slopes warm air rises valleys', 'turning late morning ferocious winds', 'cranes hit violent turbulence', 'theyll turn back risk certain death', 'suns rays weaken afternoon turbulence falls away', 'late today', 'new day new chance', 'adults must guide young hazardous trip', 'lts early morning warm air already rising fast', 'use thermals gain height', 'soon itll get stormy maybe stormy go', 'ln final ascent every wing beat desperate battle freezing winds', 'last theyve made theyve conquered highest peaks earth', 'side theres sanctuary winter', 'sun melts snow waters go way', 'start long journey back oceans', 'great unending cycle', 'sunlight fresh water bringing life every corner planet earth', 'generations humans animals alike', 'come depend great rivers seemingly endless flow', 'months drought rivers begin flow kalahari', 'buffalo reach end long journey', 'water sweeps desert lands', 'okavango transformed fertile paradise', 'africa rarely see', 'lush water world totally reliant seasonal flood', 'originating tropical ocean thousands miles away', 'many animals quite home flood', 'apprehensive bathers', 'grumbling', 'squeaking', 'grunts', 'grunts', 'squeaks', 'squeaks', 'weeks marching elephants exhausted', 'struggle stay focussed road ahead', 'soft growls', 'calf squeaks', 'matriarch smell water', 'encourages herd make one last effort', 'calf squeals', 'many weeks', 'many hundreds miles', 'theyve arrived', 'trumpeting', 'trumpeting', 'trumpeting', 'trumpeting', 'soft growls', 'like elephants waters travelled great distances reach', 'along way flow threatened extraction towns farmland', 'ln long life calf make journey many times', 'whether flood always arrive far certain', 'seasonal cycle drives lives elephants land', 'important oceans', 'whale song', 'lts july humpback whales breeding grounds tropics', 'calf weeks old', 'begins tire', 'mother supports close surface breathe', 'shallow equatorial waters make good nurseries', 'theyre warm calm predators', 'playful calf drinking litres milk day', 'mother starving', 'theres nothing eat crystal clear waters', 'find food lead calf epic mile journey', 'richer feeding grounds southern extremes planet', 'longest migration marine mammal', 'depends entirely healthy ocean along way', 'open ocean whales meet others searching food', 'dolphins closing prey', 'hundred sailfish join attack', 'reaching almost miles hour cheetahs sea', 'mother calf swim south vast open oceans', 'cross half globe', 'equator way edge antarctica', 'tropical seas long way behind', 'theyre heading stormy seasonal waters', 'strong winds currents draw nutrients depths', 'life blooms wherever suns rays penetrate', 'mother knows even richer feeding grounds south', 'hurries calf dangerous waters', 'great white shark', 'great whites attack whale calves', 'theyre victims today', 'magnificent predators top food chain', 'vital part healthy ocean', 'yet slaughter almost hundred million every year', 'populations freefall', 'creaking', 'august arctic ice vanishing fast', 'two cubs cope shifting platform', 'hungry mother forced lead back shore', 'soft growls', 'sea ice thin support cubs father', 'glacial melt waters pour land mix sea speed thaw', 'year climate warms less less ice arctic', 'disaster polar bears', 'without solid platform struggle hunt seals need survive', 'growls', 'growls', 'father make year ice almost gone', 'september whales miles equator', 'waters getting colder rougher', 'mother calf must stay close', 'lose track slap fins surface', 'hear sound signals roar ocean', 'far southat last', 'october whales entering polar waters', 'summer drawing close north beginning', 'sun melts ice life returns', 'whales finally reached antarctica time summer', 'adelie penguins', 'theyre hurry reach nesting grounds', 'december sun set', 'antarctic summer short', 'brief months warmth unlocks sheltered bays', 'ln depths something stirs', 'last mile journey humpback whales feed', 'harvest krill shrimps begin swarm soon ice retreats', 'last mother replenish reserves', 'calf join rest team', 'whales create spiralling net bubbles', 'concentrating krill one gigantic feast', 'work round clock boom shortlived', 'summer fading fast theyll soon return tropical waters', 'whales life antarctica ultimately depend krill', 'without far south would almost deserted', 'krill depend ice ice decline', 'winter antarctica', 'greatest seasonal change planet underway', 'sun begins retreat', 'soon continent plunged back darkness', 'aurora australia illuminates southern skies', 'spectacular lights bring warmth wilderness ice', 'back north planet story began', 'sea ice completely disappeared', 'male polar bear great danger', 'lf doesnt find land soon vast ocean drown', 'grunts growls', 'many days sea', 'exhausted bear drawn pungent smells colony', 'lost half body weight', 'hes desperate food', 'walrus munch larger unseal prey', 'lts pups hell get', 'powerful adults terrible damage huge tusks', 'grunting growling', 'walrus sense danger', 'adults close ranks around young', 'tests barrier', 'lt stands firm', 'may worlds biggest land carnivore', 'looks like hes met match hes badly weakened starvation', 'pup hides behind mother', 'lf prize', 'herd retreating safety water', 'bear little time left', 'tries', 'growling', 'walrus growls', 'sheer frustration', 'avoid lethal tusks costs', 'walrus growls', 'howls', 'lt slips grasp', 'lts bears verge starvation', 'theyll risk attacking dangerous prey', 'grunts', 'one took gambleand lost', 'walrus calm', 'bear longer threat', 'unable feed cant survive', 'global climate continues warm', 'arctic ice melts sooner every year', 'kind come sad end', 'year passed two bear cubs beaten odds', 'theyve left motherand thriving', 'evershifting world changing faster day', 'theyre keeping one step ahead', 'fathers adventurous spirit lives magnificent youngsters', 'next generation proof resilience life', 'polar bear become emblem state planet', 'creatures struggling live alongside uns', 'finally weve begun understand', 'precarious state lucky planet', 'lf go sharing earth rich variety life', 'preserve fragile balance children', 'ever', 'hands']