Global warming(geography) by natasha, tesa and grace y10 n


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Global warming(geography) by natasha, tesa and grace y10 n

  2. 2. WHAT IS GLOBAL WARMING?Global warming is the rise in the average temperature of Earthsatmosphere and oceans since the late 19th century and its projectedcontinuation. Since the early 20th century, Earths mean surfacetemperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980.Warming of the climatesystem is not misinterpreted, and scientists are more than 90% certainthat it is primarily caused by increasing concentrations of greenhousegases produced by human activities such as the burning of fossil fuelsand deforestation. These findings are recognized by the national scienceacademies of all major industrialized nations
  3. 3. WHAT ARE THE CAUSES OF GLOBAL WARMNG?• Global Warming is caused by many things. The causes are split up into twogroups, man-made or anthropogenic causes, and natural causes.• Natural Causes:Natural causes are causes created by nature. One natural cause is a releaseof methane gas from arctic tundra (the arctic) plain and wetlands. Methaneis a greenhouse gas. A greenhouse gas is a gas that traps heat in the earthsatmosphere. Another natural cause is that the earth goes through a cycle ofclimate change. This climate change usually lasts about 40,000 years.
  4. 4. • Man-made CausesMan-made causes probably do the most damage. There are many man-made causes.Pollution is one of the biggest man-made problem. Burning fossil fuelsis one thing that causes pollution. Fossil fuels are fuels made of organicmatter such as coal, or oil. When fossil fuels are burned they give off agreen house gas called CO2. Also mining coal and oil allows methane toescape. Methane is naturally in the ground. When coal or oil is minedyou have to dig up the earth a little. When you dig up the fossil fuelsyou dig up the methane as well.
  5. 5. • Another major man-made cause of Global Warming is population.More people means more food, and more methods oftransportation. That means more methane because there will bemore burning of fossil fuels, and more agriculture. If your in a barnfilled with animals, something smells terrible, and that smell ismethane. Another source of methane is manure. Because morefood is needed we have to raise food. Animals like cows are asource of food which means more manure and methane. Anotherproblem with the increasing population is transportation. Morepeople means more cars, and more cars means more pollution.Also, many people have more than one car.
  6. 6. • Since CO2 contributes to global warming, the increase inpopulation makes the problem worse because we breathe outCO2. Also, the trees that convert our CO2 to oxygen are beingdemolished because were using the land that we cut the treesdown from as property for our homes and buildings. We are notreplacing the trees (an important part of our eco system), so weare constantly taking advantage of our natural resources and givingnothing back in return.
  7. 7. EFFECTS OF GLOBAL WARMING• The planet is warming, from North Pole to South Pole, andeverywhere in between. Globally, the mercury is already up morethan 1 degree Fahrenheit (0.8 degree Celsius), and even more insensitive polar regions. And the effects of rising temperaturesaren’t waiting for some far-flung future. They’re happening rightnow. Signs are appearing all over, and some of them are surprising.The heat is not only melting glaciers and sea ice, it’s also shiftingprecipitation patterns and setting animals on the move
  8. 8. Some impacts from increasing temperatures are alreadyhappening:Ice is melting worldwide, especially at the Earth’s poles. Thisincludes mountain glaciers, ice sheets covering West Antarcticaand Greenland, and Arctic sea ice Sea level rise became faster over the last century. Some butterflies, foxes, and alpine plants have moved farthernorth or to higher, cooler areas. Precipitation (rain and snowfall) has increased across the globe,on average.
  9. 9. Other effects could happen later this century, if warming continues:Sea levels are expected to rise between 7 and 23 inches (18 and 59centimeters) by the end of the century, and continued melting atthe poles could add between 4 and 8 inches (10 to 20 centimeters).• Hurricanes and other storms are likely to become stronger.• Species that depend on one another may become out of sync.For example, plants could bloom earlier than their pollinatinginsects become active.• Floods and droughts will become more common. Rainfall inEthiopia, where droughts are already common, could decline by10 percent over the next 50 years.• Less fresh water will be available. If the Quelccaya ice cap inPeru continues to melt at its current rate, it will be gone by 2100,leaving thousands of people who rely on it for drinking water andelectricity without a source of either.•
  10. 10. PREDICTED EFFECTS OF GLOBAL WARMING• Rising Sea LevelThe most obvious effect of global warming is the warming of the planet. Risingtemperatures are already responsible for the melting of glaciers and ice, and if present daytrends continue the effect could be devastating as massive areas of ice begin to melt andflow into the oceans. With rising sea levels comes the danger that many areas consideredwaterfront property today could be completely under water in just a few decades.Extreme WeatherGlobal warming is predicted to heat up the worlds oceans, which means more intensehurricanes and typhoons. In addition, warmer climates around the earth are expected tochange traditional weather patterns, meaning more thunderstorms and tornadoes in someareas and devastating drought in others.
  11. 11. Some diseases will spread, such as malaria carried by mosquitoes.Ecosystems will change—some species will move farther north or become moresuccessful; others won’t be able to move and could become extinct.• Agricultural ChangesBoth the increase in temperature and changes in weather patterns are expected tosignificantly affect the agricultural industry. Droughts will have the obvious effect of makingsoil infertile, but in some areas, increased rain may have the opposite effect. What is adesert today could conceivably become a verdant valley in a century or two.• Loss of SpeciesBecause global warming is essentially speeding up what would be a natural process,extreme climatic changes impact the habitat of animals at a pace thats too rapid for themto naturally evolve to meet successfully. The result is expected to be a wholesale loss ofcertain animal species, which may mean even more devastation to an ecosystem ill-prepared to handle such rapid change.
  12. 12. • Economic EffectsThe change in agriculture will necessitate unforeseen fluctuations in the priceof food. The rise in temperatures will place economic pressures for coolingcosts, especially those who cool with electricity. The devastating storms thatmay become commonplace will result in a plethora of rising costs, from floodinsurance to health care.DiseaseScientists are already reporting that higher temperatures in Third Worldenvironments have resulted in a resurgence of infectious diseases associatedwith bacteria that thrive in warm temperatures. As global warming takes hold,these diseases are expected to widen their scope and spread quickly intodeveloped countries.