Is there a realistic roadmap to 100% renewables?
How smart energy policy can ease conflicts.
And there's a 50:50 chance of a Three Mile Island-scale disaster in the next 10 years, according to the largest statistical analysis of nuclear accidents ever undertaken.
Relativistic spacecraft must interact with the cosmic microwave background in a way that produces a unique light signature. And that means we should be able to spot any nearby, according to a new analysis.
Five years after a stern warning from Bill Gates and other business leaders, U.S. funding for energy R&D remains stuck in the mud.
The Keystone XL pipeline is a distraction from what's really needed to solve climate change.
If they're out there, other advanced civilisations should be emitting waste energy like hot exhaust. And that provides a good way to spot them, argue SETI experts.
After aircraft were targeted with high-power laser pointers in 2008, Australia banned them. But the prohibition seems to have had an entirely different effect.
LEDs outperform incandescent lights, hands down. But they should also give farmers unprecedented control over plant growth, development and nutritional content in future, say researchers.
Elon Musk says he's increasingly confident that a massive factory will lower battery costs enough for a mass-market electric vehicle.