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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.

The scientific community
To a large majority of the scientific community is quickly convinced of the magnitude of the problem and the need to analyse all aspects. The first results obtained on the Antarctic ice Vostok also suggest that the climate is a system amplifier and part of this awareness. Of course, it also benefits that average temperatures measured at the surface of the Earth in the 1980's are clearly on the rise .... The community then organized accordingly. Since 1979 the World Meteorological Organisation (WMO) put on track the Research Program on Global Climate (WCRP).
 
Governments
Governments are quick indeed not too follow suit, recognizing that this is a problem that can not be deliberately ignored. Especially since the Protocol banning the production of compounds contributing to the destruction of the ozone layer, signed in Montreal in 1987, is a prime example of what can be done in terms of global environment.

The existence of a link between human activities and global warming rests while the predictions of models that are known to remain fairly rudimentary and consequences of global warming are poorly identified. In addition, if measures to limit the use of fossil fuels must be decided, it will be difficult to accept both the concepts of economic development and individual comfort are closely intertwined with that of energy consumption. The first step is to establish a diagnosis.