Global warming

• 1. MIDDLE SCHOOLby SUBASRI MAHARAJA

2. HiGUYS 3. PRESENTED BYSUBASRI 4. POINT OUT THE FUNCTIONS OF ATMOSPHERE It is a protective sunscreen thatfilters out most of the harmful UVrays It is a store house of all natural gases It is a pipeline that moves dust, andcontaminants around the globe Keeping our planet at just right 5. Ozone layer in atmosphere 6. USES:The ozone layer forms a thinshield high up in the sky.It protects life on Earth fromthe sun's ultraviolet (UV)rays. 7. EARTHS ATMOSPHERIC GASESNitrogen (N2)Oxygen (O2)Water (H2O)Carbon Dioxide (CO2)Methane (CH4)Non-GreenhouseGases99%GreenhouseGases1% 8. DEFINITION Greenhouse gases in the atmosphere likewater vapour, carbon dioxide, nitrousoxide, methane and CFC trap the heatthat is reflected from the earth. When more of these gases are sent to theatmosphere by human activities, theatmosphere tends to trap more heat andthe earth is heated up. 9. GLOBAL WARMINGICAUSESGreenhouse gases&Greenhouse effect 10. GLOBAL WARMINGCAUSESGH GASES GH EFFECTS water vapour, carbon dioxide, methane, nitrous oxide, and Chloroflurocarban(CFCs).The greenhouseeffect is a naturalprocess thatwarms the Earthssurface. 11. GREENHOUSE GASSOURCESCO2 (CH4) CFCs N2O2 12. CARBON DIOXIDE Most important green house gas Major contributor to global warming Plants and animals release carbon dioxide whenthey breathe Carbon dioxide has increased due to Burning of fossil fuels such as coal, oil and naturalgases Global deforestation 13. HOW GLOBAL WARMING WORKSCarbon Dioxide (CO2)Fossil fuels (coal, oil, natural gas)OZONE (O3) 14. DEFORESTATION 15. METHANE SOURCE 16. METHANE SOURCE: STOMACHS OF COWS ANDSHEEP 17. Methanesource:Rice paddies 18. Coal seams and leaking gas pipes 19. NITROUS OXIDEChemical fertilizersBurning fossil fuels 20. CFCAir conditioningFoamsCleaning solvents 21. EFFECTS OF GLOBAL WARMING 22. EFFECTS OF GLOBAL WARMING Winters become shorter and warmer Summers become longer and hotter Farmers affected due to decline in water supply Polar ice caps and glaciers melt causing sealevel rise Animals and plants may have trouble adjustingto major changes in climate 23. SEASONAL CHANGESWinters shorter andwarmerSummers longer andhotter 24. WATER SUPPLYDrought 25. SEA LEVELSSea level riseFlooding,Erosion 26. PLANT AND ANIMAL LIFEAnimals have trouble adjusting to major changes inclimate 27. WHATS THE PROOF THATGLOBAL WARMING IS TAKINGPLACE? 28. PORTAGE GLACIER1914 2004 AlaskaPhotos: NOAA Photo Collection and Gary Braasch WorldViewOfGlobalWarming.org 29. Arizona COLORADO RIVERJune 2002 Dec 2003 30. INCANDESCENT LIGHT BULBS CFLs (compact fluorescentlamps) 31. AVOID PRODUCTS WITH A LOT OFPACKAGING 32. QUESTIONINGSESSION 33. GLOBAL WARMING IS CAUSED ONLY BYNATURAL CAUSES.SAY TRUE ORFALSE 34. FALSE 35. WHICH COUNTRY EMITS THEMOST GREEN HOUSE GASES? 36. CHINA 37. HOW LONG DOES IT TAKE FOR CO2 INTHE ATMOSPHERE TO DISSIPATE? 38. 100 YEARS 39. WHAT IS A GREENHOUSE GAS THAT IS RELEASEDBY HUMAN ACTIVITIES AND SPEEDS UP GLOBALWARMING? 40. CARBON DIOXIDE 41. Our take-home messageEach of us must take steps to protect our Earth's climate.