San Francisco Chronicle: Within days last week, the nation and the rest of the world got a harsh look at the problem in both scientific and political terms. But barring a Beltway miracle, nothing will change in this country's fitful efforts to clean up emissions blamed for melting ice caps, rising seas and extreme weather.
The U.N. report was the fourth of four such studies, culled from 20,000 documents. It amped up the findings that damaging changes are already under way and called for ending greenhouse gas emissions...