Construction of new U.S. farm digesters has slowed sharply over the past two years, marking a challenge for the Obama administration, which is pushing the technology as a way to curb greenhouse-gas emissions.
The franchise market is getting crowded and lots of brands are trying to get the attention of potential franchisees by offering big incentives.
By 2020, 5.4 billion people around the world will have a phone, more people than will have electricity, running water or cars on the road.
Much more is highlighted in A Look Ahead.
