The current challenge about what would be the best way to reduce emission of greenhouse gases (GHGs) drives attention to the renewable energy ethanol. It was used to minimise the effect of oil shock in the Brazilian economy during the 70's years. Now it seems a solution to diminish the emission of GHGs. Although a given project which reduce emission of GHGs, supported in a development country, should be able to receive Certified Emission Reduction (CER) and further this CER will be tradable it is mandatory that all project must be additional to reduce emission of GHGs. This study gathers information worldwide about what additional ethanol is in terms of reducing emission of GHGs.
Additionality; Kyoto Protocol; renewable energy; ethanol; photosynthesis
