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Autor materiálu: Mgr. Tereza Kufová Datum vytvoření: listopad 2012

VY_32_INOVACE_1.3.AJ3,4.19/Kf. Autor materiálu: Mgr. Tereza Kufová Datum vytvoření: listopad 2012 Vzdělávací oblast: Jazyk a jazyková komunikace Vyučovací předmět: Anglický jazyk Ročník: 3.,4. Téma: Global environmental issues

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Autor materiálu: Mgr. Tereza Kufová Datum vytvoření: listopad 2012

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  1. VY_32_INOVACE_1.3.AJ3,4.19/Kf Autor materiálu: Mgr. Tereza Kufová Datum vytvoření: listopad 2012 Vzdělávací oblast: Jazyk a jazyková komunikace Vyučovací předmět: Anglický jazyk Ročník: 3.,4. Téma: Global environmental issues Druh materiálu: prezentace, pracovní list Klíčová slova: environment, global warming, ozone layer, pollution, species Anotace: Seznámení studentů s problematikou globálních ekologických jevů pomocí prezentace učitele, úkolů pro studenty, práce s internetem, zapojení receptivních a produktivních dovedností. Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  2. VY_32_INOVACE_1.3.AJ3,4.19/Kf Metodický list: List 1-3 (stránky 3-5) – Úvod; prezentace, výklad učitele (podklady umístěny na konci prezentace, stránky…)– žáci se seznámí s fakty týkajícími se globálního oteplování, jeho příčinami a následky, s pomocí učitele pojmenovávají jevy na obrázcích. (5 min.) List 4-5 (stránky 6-7) - výklad učitele – žáci se seznámí s fakty týkajícími se ozónové vrstvy – proč vznikají ozónové díry? Co je způsobuje? Proč jsou nebezpečné?; s pomocí učitele pojmenovávají jevy na obrázcích (5 min.) List 5-6 (stránky 8-9) – výklad učitele, žáci se seznámí s fakty týkajícími se odlesňování, jeho příčinami i následky (5 min.) List 7 (stránka 10) – výklad učitele, žáci se seznámí s problematikou ohrožených druhů a jevy spojenými s tímto tématem (5 min.) List 8 (stránka 11) – pracovní list. Studenti hledají na internetu odpovědi na dané otázky. Odpovědi zapisují do sešitů nebo souboru v předem určené složce. Pokud nestihnou vše v hodině, dokončí za domácí úkol.(Odpovědi na otázky a poznámky pro učitele jsou umístěny na konci prezentace.) (25 min.) Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  3. VY_32_INOVACE_1.3.AJ3,4.19/Kf Global environmental issues Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  4. VY_32_INOVACE_1.3.AJ3,4.19/Kf Global warming Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  5. VY_32_INOVACE_1.3.AJ3,4.19/Kf - created by GRENNHOUSE EFFECT (caused by too much carbon in theair) - greenhousegases(releasedfromfactories, powerplants ), burningoffossilfuelsin cars, planes and households anddeforestationcontribute to globalwarming possibleconsequences : → droughts → floods (iceat the polesbeginsto melt, sealevelsrise) → dyingoutofsome species ofanimals Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  6. VY_32_INOVACE_1.3.AJ3,4.19/Kf The ozone layer • a layerofgashighabove the surfaceof the earth (a part of the stratosphere) characterized by the presence of ozone (the oxygen atoms with three molecules) • captures the harmful ultraviolet radiations coming from the Sun • UV raysdamageour skin and can cause cancer, theyhave the potency to destroy the lifeforms on the planet Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  7. VY_32_INOVACE_1.3.AJ3,4.19/Kf Holes in the ozone layer - depletionofthe ozone layeriscausedby substancescalledCFCs(chlorofluorocarbons) – used in refrigerators, aerosol cans; Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  8. VY_32_INOVACE_1.3.AJ3,4.19/Kf Deforestation • Rainforests: • produce oxygen whichisessentialforlife • help to controlglobalwarmingbecausetheyabsorbcarbon dioxide • are the homesof many insects, plants and animals • helpcatchwater and giveitback to the Earth in the formofclouds • - keepwater and soil in place Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  9. VY_32_INOVACE_1.3.AJ3,4.19/Kf Destroying the rainforests • largeareas are cutdownforwoodorburned to clear the landforfarming, pastures, roads, urbanareas • Lossof Biodiversity – many plants and animals lose their habitat and are pushed to extinction • Climatechange- burningreleaseslargeamountsofcarbon dioxide into the atmosphere (20% of world greenhouse gases emissions) • Disruption of the Water Cycle - the watercycleisaffected – deforestationreduces the content of water in the soil and groundwater as well as atmospheric moisture - the area mayturn to desert • Flooding and Drought - forests are able to absorb and store great amounts of water, by deforestation the regulation of the flow of water is disrupted, which leads to alternating periods of flood and then drought in the affected area • Reductionofsoilcohesion- the soiliswashedaway in the tropicalrains (erosions, landslides) Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  10. VY_32_INOVACE_1.3.AJ3,4.19/Kf Endangered species • the balance of species ofplants and animals has beenaffected by humanactivities • many animals are eitherendangeredorthreatened and someofthem are protected by law • Problems: • Pollution and climatechanges • Poaching - the illegal taking of wild plants or animals • Overfishing - fish stocks are depleted to unacceptable levels • Commercialwhaling - hunting of whales mainly for meat and oil • Killinganimalsforcommercialpurposes – elephants are killedfortheirtusks, rhinosfortheirhorns, crocodilesfortheirskinetc.) • Destroyinganimals´natural habitat Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  11. VY_32_INOVACE_1.3.AJ3,4.19/Kf • Worksheet : • Use the internet and find out: • Which are the Greenhouse Gases? • How is ocean acidification related to global warming? • Where was the largest ozone hole detected in recent years? • Which are the countries with the highest deforestation? • Are these animals according to Conservation status - Extinct (EX), Extinct in the • wild (EW), Critically Endangered (CE), Endangered (EN) or Vulnerable (VU)? • - Dingo, North African elephant, Siberian Tiger, Polar Bear, Wyoming toad, • Mountain Gorilla, Golden toad, Kakapo, Barbary lion, Giant Panda • 6. What are some of the endangered species in the Czech Republic? Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  12. VY_32_INOVACE_1.3.AJ3,4.19/Kf Teacher´s notes – Podklady pro učitele: Listy 1-3. Globalwarming: scientistssaythetemperatureoftheearthcouldrise by 3ºC overthenext 50 years. Thismay cause drought in somepartsoftheworldandfloods in others, as iceattheNorthandSouthPolesbegins to melt andsealevelsrise. Globalwarmingiscaused by thegreenhouseeffect. Normally, heatfrom he sun warmstheearthandthenescapesbackintospace. Butcarbon dioxide andothergases (fromfactories, electricityplants, cars) in theatmosphere trap the sun´s heat, andthisisslowlymakingtheearthwarmer. It is expected that most ecosystems will be affected by higher atmospheric CO2 levels, combined with higher global temperatures. Overall, it is expected that climate change will result in the extinction of many species and reduced diversity of ecosystems. Climate change is likely to affect hundreds of millions of people through increased coastal flooding, reductions in water supplies, increased malnutrition and increased health problems. Warming is expected to be strongest in the Arctic and would be associated with the continuing retreat of glaciersandsea ice. Other likely effects of the warming include a more frequent occurrence of extreme-weather events including heat waves, droughts and heavy rainfall, ocean acidification and species extinctions due to shifting temperature regimes. Effects significant to humans include the threat to food security from decreasing crop yields and the loss of habitat from inundation. Listy 4-5. Holes in the ozone layer: Ozone is almost identical to oxygen. The only difference in ozone and oxygen is that oxygen molecules contain two oxygen atoms. Ozone has three atoms of oxygen. Ozone blocks the UV radiation by absorbing it.The ozone layeris a layerofgashighabovethesurfaceoftheearththathelps to protectitfromthe sun´s ultravioletradiation, whichcandamageourskinsand cause cancer. Scientifistshaverecentlydiscoveredholes in the ozone layer, caused by substancescalledCFCs (chlorofluorocarbons). CFCs are used in refrigerators, aerosol cansand in themanufactureofsomeplasticproducts. Somecompaniesnowmakeaerosolsthat do not containCFCs, and these are oftenmarked„ozone-friendly“. Rocketlaunchesemissions– anotherfactorcausing ozone layerdepletion. There are a numberofgasesthateitherdirectly cause thedamageorchange a gasintosomethingthatdoes. Chlorineandbromine, Methane, released by cattle, fuelsandpaddyfields; nitrousoxides, mainlyfromfertilizers; and a fewmanufacturedchemicals, particularlyaerosolsdirectlyeffectthe ozone layer . The ozone layer hole is basically an area of the ozone layer, above the continent of Antarctica, which is subjected to seasonal depletion on a large scale. Ozone depletion can be basically divided into two parts - the first deals with a depletion of around four percent per decade in the stratosphere and the second deals with the rapid depletion of the stratospheric ozone at the poles. The phenomenon triggered by the emission of harmful compounds, such as the chlorofluorocarbons, halonsand carbon tetrachloride, has been going on since 1970s, and caused a considerable amount of damage to the ozone layer, especially at the poles. Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  13. VY_32_INOVACE_1.3.AJ3,4.19/Kf Listy 6-7.Deforestation Tropical forests of all varieties are disappearing rapidly as humans clear the natural landscape to make room for farms and pastures, to harvest timber for construction and fuel, and to build roads and urban areas. Although deforestation meets some human needs, it also has profound, sometimes devastating, consequences, including social conflict, extinction of plants and animals, and climate change—challenges that aren’t just local, but global. Deforestation has increased across the globe. In Washington, the need for lumber is the driving force behind deforestation. In Asia it is the need for space, and in South America it is the need for food. To compound this global trend the deforestation is increasing every year. Our use of forests are comparable to that of our use of oil but, unlike oil, we do know how much forest we have left and our current rate of consumption is far beyond our reserves.According to the World Commission on Forests, forests have virtually disappeared in 25 countries of the world, 18 countries have lost more than 95 per cent, and another 11 countries have lost about 90 per cent. Along with anthropogenic deforestation is that which is caused by global warming. The forests are being forced to move due to the increase of heat and resulting lack of water. What are the effects/consequences of deforestation? Erosion of Soil When forest areas are cleared, it results in exposing the soil to the sun, making it very dry and eventually, infertile. In addition, when there is rainfall, it washes away the rest of the nutrients, which flow with the rainwater into waterways. Because of this, merely replanting trees may not help in solving the problems caused by deforestation, for by the time the trees mature, the soil will be totally devoid of essential nutrients. Ultimately, cultivation in this land will also become impossible, resulting in the land becoming useless. Large tracts of land will be rendered permanently impoverished due to soil erosion. Disruption of the Water Cycle Trees contribute in a large way in maintaining the water cycle. They draw up water via their roots, which is then released into the atmosphere. A large part of the water that circulates in the ecosystem of rainforests, for instance, remains inside the plants. When these trees are cut down it results in the climate getting drier in that area. The groundwater tables are affected and soon get depleted. The trees help in prevention of running off of water and help the soil absorb the flowing water. When there are no trees, water just runs off, leaving no chance for the groundwater tables to absorb more water. Thus, ultimately leading to reduction in water resources. Loss of Biodiversity The unique biodiversity of various geographical areas is being lost on a scale that is quite unprecedented. Even though tropical rainforest make up just 6 percent of the surface area of the Earth, about 80-90 percent of the entire species of the world exist here. Due to massive felling of trees, about 50 to 100 species of animals are being lost each day. The outcome of which is the extinction of animals and plants on a massive scale. The effects on animals is very heartbreaking. They not only lose their habitat and protective cover, they are pushed to extinction. Many beautiful creatures, both plants and animals have vanished from the face of the earth. Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  14. VY_32_INOVACE_1.3.AJ3,4.19/Kf Flooding and Drought One of the vital functions of forests is to absorb and store great amounts of water quickly when there are heavy rains. When forests are cut down, this regulation of the flow of water is disrupted, which leads to alternating periods of flood and then drought in the affected area. Thus, leading to disruption of human settlements and loss of life in thousands. Climate Change It is well-known that global warming is being caused largely due to emissions of greenhouse gases like carbon dioxide into the atmosphere. However, what is not known quite as well is that deforestation has a direction association with carbon dioxide emissions into the atmosphere. Trees act as a major storage depot for carbon, since they absorb carbon dioxide from the atmosphere, which is then used to produce carbohydrates, fats, and proteins that make up trees. When deforestation occurs, many of the trees are burnt or they are allowed to rot, which results in releasing the carbon that is stored in them as carbon dioxide. This, in turn, leads to greater concentrations of carbon dioxide in the atmosphere. List 8. Endangered species Endangeredspecies are animalsorplantsthat are soon to dieout. Thismeansthatoncetheybecomeextinct, theywillneverbeseen on Earthagain. Many animalsandplantsbecomeendangeredorextincteachyear. Recently, however, therateofthemdyingoutincreaseddramatically. Itisestimatedthat 27,000 species becomeextincteachyear, about 3 anhour. Since 1996, scientistscalculatedthat 124 typesofamphibians, 1,108 typesofbirds, 734 typesoffish, 1,096 typesofmammals, and 253 typesofreptilesbecameendangered. Thisstatisticsalsoapply to plants. There are many reasonsthatcan cause a species ofanimalsorplants to becomeendangered, orevenextinct. Firstofall, thehumanpopulation has explodedsincethe last fewdecades. To accommodatetheoversizedhumanpopulation more and more lands are takenawayfrom these animalsorplants. Thenaturalhabitats are snatchedawayfrom these species, leavingthemonly a smallportionoftheland, whichtheyonceroamedfreely. Withthelittleamountofland these animalsorplantshave, thefoodsourcebecomescarce. Theyhave to fightamongthemselves in order to remainalive. Theyalso don't haveenoughroom to live. Sometimesanimalsorplants don't adapt to the limited spacetheynowhave, anddie. Animalsandplantsalsobecomeendangeredbecauseofthechemicalspeopleuse. Whenpeople use pesticides to killoffinsectsandotherpests, they are alsoendangeringthelivesofother species aroundthem. These chemicalsmaygetintotheriverorotherwatersources. Fish live in thewater. Theyconsumeit. Thenwhenbirdscomealongandprey on them, these birds are alsocontaminatedwiththedangerouschemicals. Theeagle, ournational symbol, alsoexperiencedthisdeadlyscenario. DDT, a type of pesticide, causedtheeggshells to becomefragile. Whenthefemaletries to incubate, sit on them, theshells just collapse. Thepopulationofeagles had gonedownrapidlywiththe use of DDT. Whenscientistsandenvironmentalistslearnofthisdanger, theyquicklybanthe use of DDT. Nowtheeaglepopulationisrebuilding. Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  15. VY_32_INOVACE_1.3.AJ3,4.19/Kf Hunting and trading are other reasons that threaten the lives of many innocent living creatures on Earth. Thousands of years, people kill animals or plants just for the fun of it, or for trading. Many of them do it illegally, or poaching. People kill animals for their fur, oil, body parts, and many other things in order to fatten their wallet. These things then, are turned into fur coat, cosmetics, perfume, oil for lamps, and traditional medicines. The tiger has been overly hunted for its bone because some people think that the bone has some magical healing power. Now the worldwide population of tiger is not doing so well. Some exotic birds are dying out because of trading. They get shipped around the world. While they are being sent, some die. Others don't adjust to the new environment also die. An example of people hunting animals just for sport and excitement was the American bison. There were more than 60 million bison living in North America a few hundred years ago. However, when the new settlers came over they hunted them for food and clothing. Later the bison was just killed for the enjoyment of the hunters. Millions of them die in just a short time. Now, there are only handfuls of them remaining. Lastly, pollution is another huge factor causing these animals or plants to become endangered. By dirtying our environment, we don't only hurt ourselves, but other living creatures around us. They too need a clean habitat to survive. By innocently eating our garbage they might get poisoned or choked to death. Many incidences have been reported where birds got choked or entangled in six-packs bottle holders. Fish and birds get entangled in our fishing lines and die. Toxic waste in the water system also has caused a large number of fish to die out. By polluting our planet, other innocent creatures also suffer. The conservation status of a species is an indicator of the likelihood of that endangered species becoming extinct. Many factors are taken into account when assessing the conservation status of a species, including statistics such as the number remaining, the overall increase or decrease in the population over time, breeding success rates, known threats, and so on.The IUCN Red List of Threatened Species is the best-known worldwide conservation status listing and ranking system. IUCN categories include: Extinct, Extinct in the wild, Critically endangered, Endangered, Vulnerable, Near threatened, Least concern. Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  16. VY_32_INOVACE_1.3.AJ3,4.19/Kf • Answers to thequestions on the student´s worksheet: • Theprimarygreenhousegases in theEarth's atmosphere are watervapour, carbon dioxide, methane, nitrous oxide, and ozone. • Oceanacidificationrefers to theoveralldecrease in pH leveloftheoceans. Thisiscaused by carbon dioxide (CO2) emissionsfromtheatmospherethat are absorbedintotheocean. Oceanacidificationis a naturalprocessthatoccursregularlyandis a self-sustainingprocess, onceitstartsitisdifficult to stop. Risingcarbon dioxide (CO2) emissions in theatmosphere are in directcorrelation to therisingCarbon dioxide (CO2) levels in theoceans. • Carbon dioxide andhydrogen bond together to formcarbonicacid. Carbonicacidis a weakacid, • though in largequantitiesitbecomesincreasinglydangerous to ouroceanicecosystem. • CO2 dramaticallyaffects species ofclams, oysters, urchins, andshallowwatercoral. These organismshaveshownthatwithan abundance of CO2 formationofshellshavedecreased, which has put themat risk. Onceshelledorganisms are at risk, theentirefoodchainmaybe as well. About 50% ofallcoralreefshavebeendestroyed. Many believethatglobalwarming has something to do withoceanacidification. Greenhousegases are makingtheearthhotter as thedecades go by. Oceanacidification has affectedboththeNorthandSouthpolaricecaps. Wecanseetheaffectofthemeltingicecaps as waterlevelsincrease. Studieshaveshownthatoverthe past decadewaterlevelshaverisen 4–8 inches.4 Acidificationisan on goingproblemfortheentire planet, andprojectednumbers show thatitcanonlygetworse. • Reductions of up to 70% in the ozone column observed in the austral (southern hemispheric) spring • over Antarctica and first reported in 1985 are continuing. Through the 1990s, total column ozone in • September and October have continued to be 40–50% lower than pre-ozone-hole values. In the • Arcticthe amount lost is more variable year-to-year than in the Antarctic. The greatest declines, up • to 30%, are in the winter and spring, when the stratosphere is colder. Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  17. VY_32_INOVACE_1.3.AJ3,4.19/Kf 4.World Top Ten CountriesWithHighestDeforestation Country(SQ MILES): Brazil 8,915, Indonesia 5,065, Sudan 3,702, Zambia 3,286, Mexico 2,436, Dem. Rep. ofCongo 2,054, Myanmar 1,996, Nigeria 1,537, Zimbabwe 1,235, Argentina 1,100 5.Dingo(VU), NorthAfricanelephant(EX), SiberianTiger(EN), PolarBear(VU), Wyoming toad(EW), MountainGorilla(CE), Goldentoad(EX), Kakapo(CE), Barbary lion (EW), Giant Panda (EN) 4. Open answers – e.g. lynx, bear, woolf, cockof the wood (tetřev), crayfish, stork Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

  18. Obrázky: http://www.scenicreflections.com/ithumbs/Global%20environment%20Wallpaper__yvt2.jpg http://www.bionomicfuel.com/wp-content/uploads/2008/10/global-warming-negative-and-positive-effects_2.jpg http://vtm.e15.cz/files/imagecache/dust_filerenderer_normal/upload/aktuality/konec_m_tu_o_konci_glob_ln_ho_oteplov_n__4f7c2e6aa4.jpg http://www.bionomicfuel.com/wp-content/uploads/2010/02/top-5-natural-causes-of-global-warming_1.jpg http://www.youthmagz.com/artikel-149-Facts-and-Information-about-Global-Warming-for-Kids.html http://www.ecoblog.co.za/wp-content/uploads/2010/09/Global-Warming.jpg http://www.buzzle.com/img/articleImages/397608-18831-47.jpg http://www.ust.hk/~webpepa/pepa/ways_of_protection/ozone_decay_process.gif http://static.howstuffworks.com/gif/ozone-layer-2.jpg http://greatwesternpainting.com/ECO%20Painting%2040.jpg http://www.globalwarmingandu.com/images/What-Are-The-Causes-Of-Ozone-Depletion.jpg http://i.telegraph.co.uk/multimedia/archive/02195/carExhaust_2195976b.jpg http://www.stri.si.edu/sites/rainforest/images/rainforest/Rainforest2002-0202.jpg http://1.bp.blogspot.com/-To49sp21P4g/TZR2X09-zxI/AAAAAAAAML4/kb0uL4kZw1Q/s1600/endangered_species.jpg Zdroje: CHUDÁ, Jana a Tomáš CHUDÝ. Topics for English conversation: we get ready for the graduation exam. 2. vyd. Havlíčkův Brod: Fragment, 1996, 87 s. ISBN 80-720-0051-9. EL-HMOUDOVÁ, Dagmar. Angličtina pro střední školy. 1. vyd. Třebíč: Petra Velanová, 2006, 223 s. Maturita (Petra Velanová). ISBN 80-868-7302-1. Global warming. In: Wikipedia: the free encyclopedia [online]. San Francisco (CA): Wikimedia Foundation, 2001- [cit. 2012-11-21]. Dostupné z: http://en.wikipedia.org/wiki/Global_warming Ozone depletion. In: Wikipedia: the free encyclopedia [online]. San Francisco (CA): Wikimedia Foundation, 2001- [cit. 2012-11-21]. Dostupné z: http://en.wikipedia.org/wiki/Ozone_layer_depletion Effects of deforestation. In: Http://ccaverinaxaveria.wordpress.com [online]. 2012 [cit. 2012-11-21]. Dostupné z: http://ccaverinaxaveria.wordpress.com/2012/08/17/biology-assessment-task-3-effects-of-deforestation/ Endangered species. In: Wikipedia: the free encyclopedia [online]. San Francisco (CA): Wikimedia Foundation, 2001- [cit. 2012-11-21]. Dostupné z: http://en.wikipedia.org/wiki/Endangered_species Conservation status. In: Wikipedia: the free encyclopedia [online]. San Francisco (CA): Wikimedia Foundation, 2001- [cit. 2012-11-21]. Dostupné z: http://en.wikipedia.org/wiki/Conservation_status Endangered species. In: Library.thinkquest.org [online]. 2012 [cit. 2012-11-22]. Dostupné z: http://library.thinkquest.org/19689/data/esframe.html VY_32_INOVACE_1.3.AJ3,4.19/Kf Autorem materiálu a všech jeho částí, není-li uvedeno jinak, je Mgr. Tereza Kufová CZ.1.07/1.5.00/34.0501

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