Panel Supports a Controversial Report on Global Warming. The National Research Counsel has endorsed, with some caveats, Michael E. Mann’s famous 1999 study [pdf] showing a sharp increase in warming trends over the last decades, and particularly in the 1990s. Mann is probably most well known as the source of the so-called “hockey stick,” the graph of mean global surface temperatures showing stable temperatures for hundreds of years, followed by a swift uptick in the last few decades. Mann concluded that the 1990s was probably the warmest decade in the last thousand years, and 1998 in particular probably the warmest year. Mann has been profiled in Seed Magazine, Mother Jones, and Scientific American [pdf], among others.
I should mention that “controversial” is the NYT’s word, not mine. The report is controversial really only in the sense that there exists political opposition to Mann’s conclusions. The report from the NRC demonstrates—indeed, explicitly states—that although there is some scientific disagreement about details, the consensus of the climatology community is that Mann basically got it right.
RealClimate has more on the NRC’s report, including a discussion of the more recent research.

