 Climate change raises a number of particularly challenging ethical issues about distributive justice, in particular concerning how to fairly share the benefits and burdens of climate change policy options.Many of the policy tools often employed to solve environmental problems such as cost-benefit analysis usually do not adequately deal with these issues because they often ignore questions of just distribution.In December 2004 in Buenos Aires, Argentina, the "Collaborative Program on the Ethical Dimensions of Climate Change" was launched at the 10th Conference of Parties to the United Nations Framework Convention on Climate Change.