Environment News Service: The Philadelphia Phillies have signed up to buy 20 million kilowatt hours of renewable energy to serve the ball club’s 43,500-seat Citizens Bank Park. With this purchase the team has become the largest green power purchaser in major league baseball. The Phillies’ purchase of 20 million kilowatt hours of renewable energy certificates will offset the carbon footprint created by the organization’s utility power usage at Citizens Bank Park for one year. The Phillies’ purchase …