GLOBAL WARMING

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Presentation Transcript

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WHAT IS GLOBAL WARMING ? Global warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate.

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When scientists talk about the issue of climate change, their concern is about global warming caused by human activities. , in particular the burning of fossil fuels and the resulting buildup of greenhouse gases in the atmosphere, have influenced this warming trend.

NATURAL GREEN HOUSE EFFECT : 

NATURAL GREEN HOUSE EFFECT Sunlight (shortwave radiation) passes easily through the earth's atmosphere. Once it strikes and warms the earth's surface, lnfrared radiation is given off and goes back into the atmosphere. While some of this Infrared radiation or heat escapes into space, most of it is absorbed or held by carbon dioxide and other green gases like water vapor, carbon dioxide, methane, nitrous oxide, and ozone that exist in small quantities in the atmosphere.

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These gases form a `blanket' that keeps the earth an average of 33 degrees centigrade warmer. Without these gases the whole planet would be an icy wasteland with an average temperature of 16 degrees centigrade below freezing

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Increase in carbon dioxide cause the earth to get warmer CO2 contributes about 50% to the greenhouse effect Carbon dioxide is produced from burning wood, coal, gas, etc. The increase in carbon dioxide in the atmosphere is increasing the heat being absorbed from the earth. This trapped heat increases the evaporation of water from the oceans into the air to cause a greater increase in warming of the atmosphere. CO2 has a forcing effect on climate.

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Effects of other gases Methane is emitted during the production and transport of coal, natural gas, and oil. decomposition of organic wastes in municipal solid waste landfills and the raising of livestock. Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of solid waste and fossil fuels. Very powerful greenhouse gases that are not naturally occurring include hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6), which are generated in a variety of industrial processes.

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Spread the word! Tell other people things that they can do to help prevent global warming. Remember -- Every person makes a difference!

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Impacts of Global Warming Millions at Risk of Hunger and Water Stress in Asia Unless Global Greenhouse Emissions Cut

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Climate Change Hits Hard on Latin America and the Caribbean.

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Polar bear "walking on thin ice" across the Arctic in order to reach marine seal-hunting grounds.

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The Arctic is heating up at least twice as fast as the rest of the planet, according to the final report of the Arctic Climate Impact Assessment

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Some of the findings are as under The 1990’s was the warmest decade, and 1998 the warmest year on global record. The burning of coal, oil & gas has increased the amount of CO2 in the atmosphere by 30% over natural levels The Earth is warming faster than at any time in the past 10,000 years

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What we can do, to stop GLOBAL WARMING? Use the washing machine or dishwasher only when they are full Take a shower instead of a bath Use less hot water Be sure you’re recycling at home Reuse your shopping bag Plant a tree Buy locally grown and produced foods Buy fresh foods instead of frozen Seek out and support local farmers markets Buy organic foods as much as possible Eat less meat

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Reduce the number of miles you drive by walking, biking, carpooling or taking mass transit wherever possible Keep your car tuned up Drive carefully and do not waste fuel When it is time for a new car, choose a more fuel efficient vehicle Try car sharing Try telecommuting from home Fly less Encourage your school or business to reduce emissions Join the virtual march Encourage the switch to renewable energy Protect and conserve forest worldwide Consider the impact of your investments Make your city cool Tell Congress to act Make sure your voice is heard!

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What difference can I make ?

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