Business Green: A US-based affordable housing developer plans to raise $4bn over the next five years to build and retrofit 750,000 residential, community and commercial buildings nationwide in a bid to make them more energy-efficient. The not-for-profit Enterprise Community Partners was founded by pioneering urban developer James Rouse, and has seen its profile boosted in recent years after Rouse’s grandson, the actor Edward Norton, took a place on the organisation’s board. The social …