By Ben Geman - 01/12/10 06:55 PM EST
The third one is messy -- a "fragmented multilateralism" in which the UN holds sway over some areas where deals can be cut, like forest preservation, while other tricky topics are dealt with in a range of other venues. For instance, global financial institutions like the International Monetary Fund would handle climate finance, the MEF would grapple with technology and emissions reductions targets, while the G20 would handle issues like phasing out fossil energy subsidies (which it has already begun to address) and global carbon markets.
Worth a read.
This post was updated at 4:17 p.m.