Throughout the history of international efforts to mitigate climate change, the greatest difficulty has been ______.
finding an approach to emissions reductions that developed and developing countries all consider fair
the unwillingness of the United States and Germany to agree to binding fossil fuel emissions cuts
disagreement over the extent to which climate change is natural and unavoidable and the extent to which it is driven by human activity
obstructionism by countries that feel they are likely to benefit from a changing climate
