Large cities are more productive than small ones so it shouldn't come as a surprise that they produce more CO2 as well, say physicists.
Electric vehicles can be so quiet that they pose a new risk on the road. But what kind of artificial sound should be added?
A proposed pipeline from Canada won't increase greenhouse gas emssions.
A leaked UN climate report suggests we're spending far too little on clean energy.
The ability to teleport energy from one location to another could revolutionise the way quantum devices operate, but only if it can be made to work over practical distances. Now physicists think they know how.
Tesla and GM have both issued fire-related recalls, but Tesla’s fix doesn’t require owners to bring their cars in.
At CES, Ford shows a concept for increasing the amount of solar power a car can generate.
Advances in LEDs and lithium-ion batteries have produced some unusual new flashlights.
Investments in energy start-ups can count as charitable grants. Could this funding approach help get new technologies to market?
Routing gas around Europe using the same decentralised control techniques developed for the internet could reduce the way energy crises cascade, say network and complexity theorists.