The technology for making fuel from wood chips and grass is late, but still on the way.
Some studies suggest we can easily drop nuclear and fossil fuels, but they raise serious questions.
Fast reactors can shrink nuclear-waste stockpiles, but can designers tame the inherent hazards?
Transatomic is developing a new kind of molten-salt reactor designed to overcome the major barriers to nuclear power.
Philips invites developers to write apps for its Hue wireless LED light bulbs.
There are now many general-purpose consumer LED bulbs that give off good light. With so many, how can you tell the difference?
Companies showed off their latest clean energy innovations at the ARPA-E Summit.
Some of the nuclear power plants shut down after the Fukushima disaster could restart soon.
Humans may be wired to respond more to immediate issues like fracking than longer term ones like global warming.
Researchers have demonstrated a way to give concrete surfaces the ability to heal when small cracks appear, an advance that could allow bridges and other structures to last longer.