According to Bertrand et al. (2002), the projected anthropogenic global warming can be determined by using the SRES scenarios. Although early experiments and researches (Bertrand et al., 2000), showed that volcanic perturbations could be a possible source of the temperature changes in the Earth over the last century, later researches indicated that there are three main conditions to volcanic forcing. They are a permanent level of very high volcanic activity, a huge stratospheric burden, which has never been noticed before in the past, and it requires long time. Therefore, it is said that the dominant cause of global warming in the twenty first century is changes in atmospheric trace-gas concentrations (Bertrand et al., 2002). The rising of temperature has begun since 1970. Moreover, before industrialization temperature has increased due to volcanic and solar variability. These factors can result in rising of temperature as well as cooling which leads to the Ice Age (Bertrand et al., 2002). Moreover, according to Wigmore (2007), the issue of global warming is natural since the climate change is part of a cycle... [continues]
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