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Global warming has become perhaps the most complex problems of world leaders. On the other hand, the warnings of the scientific community is becoming increasingly difficult due to the increasing number of scientific information increases the risk of continuous accumulation of greenhouse gases related to human - is produced mainly from fossil fuels and forests. On the other hand, the technological, economic and political problems that must be resolved before a joint effort to reduce global emissions would need to start easier, especially in the face of global economic slowdown.