The UN climate change summit in Durban, South Africa, wrapped earlier this month with two notable accomplishments: a pledge to create a new international treaty to replace the Kyoto Protocol in 2020, and the creation of a multi-billion dollar fund to help developing nations adapt to the effects of climate change.

Some have expressed disappointment in Durban’s outcomes, and have pointed to the challenges inherent to the current UN negotiating framework. Among the challenges: asking national environmental ministers to hammer out an international framework that must go well beyond environmental concerns to be effective, and the tiered system of “developed” and “developing” nations which does not necessarily represent the current state of global economics and politics. [New York Times]