Wall Street climbs with energy rebound, Pfizer deal

By Caroline Valetkevitch NEW YORK (Reuters) - U.S. stocks climbed on Thursday as energy shares bounced with oil prices, while news Pfizer would buy Hospira in a massive deal further boosted the market. The S&P energy index jumped 1.5 percent as oil prices rebounded sharply from the previous session. U.S. crude rose 4.2 percent to settle at $50.48 following increased violence in producer Libya and an expected boost in oil demand from China's central bank easing. On Wednesday, the Europea