y the Intergovernmental Panel on Climate Change (IPCC) gave the alarming message that it is now more than 90% certain that human activities contribute to a global average temperature increase.1 The report further stressed the rationale for speedily limiting and reducing the amount of anthropogenic greenhouse gas emissions released in the atmosphere. Two years earlier, on 16 February 2005, the Kyoto Protocol entered into force, putting into place a binding system that included greenhouse gas emission limitation and reduction commitments for