8 Oct 2012

Global Warming

Global warming
By Nirali Sejpal

The influence of manmade global warming on the climate system continues to grow, with human fingerprints identified in more than two dozen climate “indicators” examined by an international research team — from air temperatures to ocean acidity — for a comprehensive annual “State of the Climate” report released Tuesday.
In a related study also released on Tuesday, climate researchers said manmade global warming is already shifting the probability of many extreme weather and climate events, making heat waves, droughts, and other events more likely to occur in some parts of the world. The study found that manmade global warming made the devastating Texas drought and heat wave of 2011, which was the most expensive drought in the Lone Star State's history, at least 20 times more likely compared to years with similar large-scale weather patterns in the 1960s. The report also tied other recent extreme events worldwide to manmade warming.
Together, the two reports amount to a comprehensive accounting of the present state of the climate system, over which mankind is now exerting a greater impact than ever before.
        “Every weather event that happens now takes place in the context of a changing global environment,” said deputy NOAA administrator Kathryn D. Sullivan in a press release. The reports were released during a time when extreme weather events have been making international headlines, with the U.S. having just experienced an historic heat wave that has withered crops. Drought has expanded across the lower 48 states, affecting 56 percent of the contiguous U.S., and Russia is burying the dead from flash flooding that struck Krymsk, a small town near the Black Sea. Through June, the U.S. has had its warmest 12-month period, warmest year-to-date on record, and also saw a string of deadly wildfires.
The “State of the Climate 2011” report, published by the National Oceanic and Atmospheric Administration (NOAA) and the American Meteorological Society (AMS), presents a peer reviewed tour through the weather and climate events of 2011. The overriding theme that emerges from the report is that the effects of human activities are readily evident, be it in the form of rising concentrations of greenhouse gases in the atmosphere — global carbon dioxide concentrations hit a new all-time high of 390 parts per million last year, and will cross the 400 ppm threshold worldwide by 2016 — to the inexorable increase in ocean heat content.
The report shows that a La Nina event, characterized by cooler-than-average sea surfac e temperatures, helped keep global average surface temperatures down compared to 2010, but it was one of the warmest La Nina years on record.
In the Arctic, which has been warming at twice the rate of the rest of the globe, 2011 had the second-lowest sea ice extent on record. Barrow, Alaska, located above the Arctic Circle, experienced a record 86 straight days when the temperature failed to drop below freezing.
The Impacts of global warming
It's nearly impossible to overstate the threat of climate change. Greenhouse gas emissions are rising more rapidly than predicted and the world is warming more quickly in response.

            Global warming will have 
catastrophic effects such as accelerating sea level rise, droughts, floods, storms and heat waves. These will impact some of the world's poorest and most vulnerable people, disrupting food production, and threatening vitally important species, habitats andecosystems.
As we work to reduce emissions, we must simultaneously begin to adapt to the increasing
impacts of climate change.There are many causes of Global Warming. The destruction and burning down of tropical forests , traffic clogging up the city streets , rapid growth of unplanned industries, the use of CFCs in packaging and manufacturing products, the use of detergents etc. cause Global Warming. Besides, overpopulation, deforestation are the causative factors of Global Warming. The setting up of mills and factories in an unplanned way has a great effect on environment. These mills and factories produce black smoke which gets mixed with air and increases the amount of CO2.
                 Burning of Gas such as Methane (CH4) and fuel also increase CO in the environment. Killing animals like birds, big cats, lions, tigers is also a alarming cause of Global Warming.
                 The effects of Global Warming is very dangerous for our existence and survival. The sun’s scorching heat comes to earth in a direct way. Therefore, the earth’s surface becomes seriously heated. Agriculture, forestry and fishery is seriously be damaged. This can catastrophically reduce mankind’s ability to grow foods, destroy wildlife. Global Warming also cause sea-water to swell up. All species are important for maintaining ecological balance. If one is lost, the whole natural environment changes. To prevent the dangerous effects of Global Warming necessary steps should immediately be taken.
                People should not be allowed to cut off trees which causes deforestation. Rather they should be advised and suggested to plant more and more trees in accordance with their capability and convenience. Forests also control the natural balance. People should be made aware of it. Mills, factories, brick-fields should be set up in a very good planned way. There should be well drainage system to pass away waste materials, wastages and poisonous chemicals.
The alarming world’s climate is very dangerous for mankind and ecological balance. Unless Global Warming is not controlled, no men, animals will be able to live, grow and thrive. So, we should try maintain the ecological balance to decrease the effects of Global Warming


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