Réponses

2014-02-26T17:43:35+01:00
Essential to life on Earth, the greenhouse effect is due to the natural presence of certain gases in the atmosphere. Since the twentieth century, it is accented by additional gas emissions related to human activities such as agriculture, the use of fossil fuels and industrial discharges. According to an overwhelming majority of scientists, the excess greenhouse effect due to human activities has played a key role in climate change in recent decades
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2014-02-26T18:18:52+01:00
Global warming refers to an unequivocal and continuing rise in the average temperature of earth's climate system.