In the four and a half billion years of our planet's history, the parameters that characterize the climate of the earth have undergone considerable fluctuations. For the time being, we can say that the rise of the mean atmospheric temperature of the planet (in the 20th century) was 0.75 οC per 100 years (IPCC, 2011). A significant part of this warming, has been attributed to changes in the atmospheric composition due to human activity, and has prevailed to be called "anthropogenic component of climate change" or simply "anthropogenic climate change".
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