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Sunday, 18 May 2008 |
 The fact that man is changing the composition of atmospheric carbon dioxide through the use of coal. From a relatively simple calculation, he believes that our planet will warm by 5 degrees by the end of the 20th century ... But it was not until 1970's that the problem of the action potential of human activities on climate becomes an object of attention of scientists.
The modelers take first conscience. The years after the Second World War saw the onset of computers, so far rudimentary. The weather forecasting is one of the areas explored from models based on a system of physical equations for describing the movement of the atmosphere and the cycle of water evaporation from the ocean surface until 'The formation of precipitation.
But climatologists are very quickly the ability of these models to account for different climates from that in which we live today. The experiments conducted during the 1970 review the case of doubling the carbon dioxide content. They confirm that such a change would result in significant warming. These results are taken seriously and motivate scientific meetings and expert reports including one published in 1979 at the initiative of NSF (National Science Foundation in the USA) the conclusions already well documented. |
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Last Updated ( Thursday, 03 July 2008 )
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Sunday, 18 May 2008 |
The global average temperature has increased over the past 150 years. This chart was prepared by comparison with the period from 1961 to 1990. She is represented by the horizontal line to 0. The anomalies or variations compared to the average, are given for each year.
The global average temperature for a given year is indicated by a blue or red. For example, the year 1900 was cooler by 0.2 ° C above the 1961-1990 average. The hottest year here was 1998, hotter almost 0.6 ° C above the 1961-1990 average.
The thick blue line and red indicates the average global temperature for periods of five years. For example, the average temperature for 1998-2002, focusing on 2000, was higher by 0.4 ° C above the 1961-1990 average. The period from 1958 to 1962, focusing on 1960, corresponded exactly to the average.
This figure was based on data from the Climate Research Unit at the University of East Anglia.The chart below shows the average temperature of the Northern Hemisphere during the last two millennia.
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Last Updated ( Thursday, 03 July 2008 )
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Thursday, 15 May 2008 |
 During the last century, the temperature on Earth has increased by approximately 0.6 ° C. According to scientists, it could still increase by 1.4 to 5.8 C during this century. Recent reports published by the Intergovernmental Panel on Climate Change (IPCC) confirmed. Many of us think maybe that is just, some people find even an average 5 degrees C it's rather pleasant. Given the global level, it could change the climate on Earth as never before. A change in climate means indeed, depending on the region, more or less precipitation, sea level rise and oceans and a significant influence on plants and animals.
The fact that global warming has accelerated mainly during the 90 years of the last century is of particular concern. It was the hottest decade of the century and one assumes even the millennium.
The consequences are already clearly visible: the ice caps melt and glaciers in the polar areas not recede during the months of summer and autumn. There is currently a 40% reduction of the thickness of the ice from the North Pole over fifty years ago. The sea level rose by 17cm in the last century (because of warming of sea water and melting of land ice). In the Northern Hemisphere, becoming drier summers and wetter winters… So there is a significant change patterns of time in the long term, so that we can talk because of climate change.
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Last Updated ( Thursday, 03 July 2008 )
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Thursday, 15 May 2008 |
The scientific method that made possible this progress represents a cultural achievements of the most impressive of mankind. In collecting and analyzing data, developing hypotheses and designing experiments to test them, scientists have succeeded in clarifying many of the best-kept secrets of nature. The lively debate and sometimes immoderate between theories and research teams competing testimony to the vitality of this quest for truth and knowledge.
The particular contribution of the IPCC has been to make science, neutral with regard to values, more accessible to the world of political action, based on values. The IPCC does not lead to new research. Its mission is to conduct assessments, relevant for policy, literature existing in the world on scientific, technical and socio-economics of climate change. The evaluation reports published in several volumes by the IPCC in 1990, 1996 and 2001 have played a crucial role in motivating governments to adopt and implement the United Nations Framework Convention on Climate Change and the Protocol Kyoto.
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Last Updated ( Thursday, 03 July 2008 )
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Thursday, 15 May 2008 |
The science of climate change has increased considerably since the publication by the Intergovernmental Panel on Climate Change (IPCC) of its first assessment report, there are seventeen years.
The evidence available to researchers - ice cores and other traces of past climates to satellite measurements of the twenty-first century - have increased dramatically. The spectacular gains power computers allies theoretical knowledge increasingly solid better understand how oceans and the atmosphere react to increasing quantities of greenhouse gases.
The scientific method that made possible this progress represents a cultural achievements of the most impressive of mankind. In collecting and analyzing data, developing hypotheses and designing experiments to test them, scientists have succeeded in clarifying many of the best-kept secrets of nature. The lively debate and sometimes immoderate between theories and research teams competing testimony to the vitality of this quest for truth and knowledge.
The particular contribution of the IPCC has been to make science, neutral with regard to values, more accessible to the world of political action, based on values. The IPCC does not lead to new research. Its mission is to conduct assessments, relevant for policy, literature existing in the world on scientific, technical and socio-economics of climate change. The evaluation reports published in several volumes by the IPCC in 1990, 1996 and 2001 have played a crucial role in motivating governments to adopt and implement the United Nations Framework Convention on Climate Change and the Protocol Kyoto.
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Last Updated ( Thursday, 03 July 2008 )
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Climate Change 
