John Tierney: Politics in the Guise of Pure Science - 'Why, since President Obama promised to "restore science to its rightful place" in Washington, do some things feel not quite right? First there was Steven Chu, the physicist and new energy secretary, warning The Los Angeles Times that climate change could make water so scarce by century's end that "there's no more agriculture in California" and no way to keep the state's cities going, either. Then there was the hearing in the Senate to confirm another physicist, John Holdren, to be the president's science adviser. Dr. Holdren was asked about some of his gloomy neo-Malthusian warnings in the past, like his calculation in the 1980s that famines due to climate change could leave a billion people dead by 2020. Did he still believe that? "I think it is unlikely to happen," Dr. Holdren told the senators, but he insisted that it was still "a possibility" that "we should work energetically to avoid." Well, I suppose it never hurts to go on the record in opposition to a billion imaginary deaths...'