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.
Subtracting nuclear reactors in the U.S. could make it tougher to meet climate goals.
We should think sensibly about nuclear energy’s risks.
The energy-efficient power networks of the future will require entirely new ways of forecasting demand on the scale of individual households. That won't be easy.