Antarctica is losing ice much faster than thought, say scientists who have built the most complete picture of Antarctica's glaciers showing exactly how fast the ice sheets are cracking. The mass of

In their policy forum ("The limits of consensus," 14 September 2007, P. 1505), M. Oppenheimer et al, make several misleading statements. They suggest that a premature drive for consensus led Working Group I to understate the risk of large future sea-level rise in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (WGI-AR4). (Letters)

This paper contains the proceedings of the IPCC scoping meeting on renewable energy sources held at L