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The enhanced greenhouse effect is a complicated political issue There are numerous popular misconceptions For example, it is a misconception that the destruction of the Amazon rainforest contributes to the enhanced greenhouse effect It does not, rainforest are mostly greenhouse gases producersIn terms of the net increase in the greenhouse effect due to humanproduced greenhouse gases, CO 2 is responsible for the lion's share CO 2 from fossil fuel burning alone is more than half the net force If you add CO 2 from fossil fuel burning, deforestation, and other minor sources, this comes to a little more than threefourths of the net The CO2 that nature emits (from the ocean and vegetation) is balanced by natural absorptions (again by the ocean and vegetation) Therefore human emissions upset the natural balance, rising CO2 to levels not seen in at least 800,000 years In fact, human emit 26 gigatonnes of CO2 per year while CO2 in the atmosphere is rising by only 15 gigatonnes per year much