New IPCC report in the news

The Post's Juliet Eilperin reported findings of the new IPCC report released on 2/2/07. The report states, with a 90 percent certainty, that humans are responsible for global temperatures that will propbably increase by as much as 4.5 degrees F by 2100. This will result in melting polar ice sheets and the extinction of huge numbers of species--events that could be irreversible. More extreme weather, such as droughts in the US southwest and heavier rains in the northeast, are to be expected.
NYT carries the basically the same reporting on the publication itself, then reports that some scientists believe the IPCC is too conservative in its forecasting. Cornelia Dean reports that scientists researching sea level rise are particularly unhappy with the IPCC's latest warnings. Quoting a US scientist as asserting that "the observed sea level rise has been tracking the upper range," Dean reports that with a 2005 cutoff for research findings, the panel didn't take into account the fact that ice sheets appear to be melting at a more accelerated rate than had been expected.
Newsweek.com also weighs in with a pre-release article that criticizes the IPCC for being too reticent. Based on some of the same information as the NYT article, Newsweek also quotes a German scientist on the speed of ice melting. The problem of conservative estimates is blamed on the requirement for unanimous agreement on report language by representatives of 154 countries.