When it comes to renewable energy, wind and solar get a lot of attention. But wood actually creates more power in the U.S., and Massachusetts state officials are scaling back their efforts to encourage wood power. It may be a renewable resource, they say, but that doesn't mean it's good for the environment.
PBS NewsHour continues their energy series with a visit to Colorado. Coal has been a traditional source of electrical energy in the state, but now a new energy source - natural gas - is making inroads.