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John Holdren. (Credit: Harvard Univ. / Copyright Martha Stewart)[UPDATED, 10:50 p.m.: John P. Holdren, a Harvard physicist best known as a strong proponent of cutting greenhouse gas emissions and a specialist on energy technology policy and nuclear nonproliferation, has been chosen to be Mr. Obamas science adviser, according to two people close to Dr. Holdren and one person involved in the decision. Those people spoke only on condition of anonymity because Mr. Obama had not formally announced the nomination. That announcement, they said, is scheduled to come in Mr. Obama’s Saturday radio address. The Obama transition team declined to confirm the nomination.