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?
The sell-off of synthetic biology pioneer LS9 goes to show that making biofuels from genetically engineered microbes has yet to deliver economically.
GE's nuclear waste-burning PRISM reactors get a new chance at commercialization.
Reducing water consumption at solar thermal plants raises costs and decreases power production.
A proposed pipeline from Canada won't increase greenhouse gas emssions.
Startup Global Bioenergies uses genetic engineering to avoid one of the costliest steps in biofuel production.
New approach developed at MIT could generate power from sunlight efficiently and on demand.
A low-power, multiroom sensor network watches for drips and runs on a coin-cell battery.
Aquion has started production of a low-cost sodium-ion battery aimed at making renewable energy viable.