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I N T R O D U C T I O N For hundreds of years climates on earth have gone through great changes The changes are caused by many activities that have occurred and are presently occurring on earth Increasing evidence indicates that human impact on the environment is causing local and perhaps worldwide changes in climate At various times glaciers have moved down across the continents into regions that are now warm This effect of global warming is the meltdown of glaciers of Greenland and Antarctica that could raise sea levels all over the world The burning of fossil fuels- coal natural gas and oil- are constantly adding carbon dioxide into the air In addition industries are producing more chloroflourocarbons CFCs nitrous oxide and methane which are all greenhouse gases Koral 4 The resulting warming of the atmosphere or Global Warming could have serious effects W H A T I S T H E G R E E N H O U S E E F F E C T Similar to a greenhouse the earth is warmed by the sun The sunlight striking Earths surface is converted into infrared heat radiation Most of this heat will escape back into space but today much more of it is being trapped in the earths atmosphere Due to the resemblance to the way that heat is trapped in a greenhouse scientists call this trend toward increasing global warming the Greenhouse Effect Koral 9 Scientists also say that because of the greenhouse effect our weather may change more in the next decade than in the last tens of thousands of years They predict that the earth will become hotter For instance in some parts of the world winters will be warmer while summers will be hotter As mentioned earlier another possible result of the greenhouse effect will be that the worlds oceans will rise probably one to four
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