With the first commitment period of the Kyoto Protocol expiring in 2012, time seems to be running out for a new successor agreement. The Protocol remains the most comprehensive attempt to negotiate binding limits on anthropogenic greenhouse gas (GHG) emissions. The long-term challenge, defined by the United Nations Framework Convention on Climate Change (UNFCCC), is to stabilise GHG concentration in the atmosphere at levels that would prevent interference with the climate system. There are, however, economic and social realities that drive anthropogenic GHG emissions.