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WASHINGTON (Reuters) - New York Mayor Michael Bloomberg joined with the Sierra Club on Thursday in a $50 million, four-year plan to campaign for replacing one-third of aging U.S. coal-fired power plants with clean energy. "If we are going to get serious about reducing our carbon footprint in the United States, we have to get serious about coal," Bloomberg, founder of the news service that bears his name, said in a statement.

NORDEN, Calif. - On a frosty evening in the Sierra Nevada, smoke curling from the chimney of the Clair Tappaan Lodge is a welcome sight to chilly snowshoers and cross-country skiers