When it comes to cities, being big and rich is better for the planet than being big and poor, according to a new study of carbon dioxide emissions from cities around the world. But is this correct?
Engineers have built a powerful microscopic engine that relies on the combustion of hydrogen and oxygen. One problem: nobody knows how it works.
A startup says it has a more efficient process to use carbon dioxide for making valuable chemical feedstocks.
The Fukushima disaster led Japan to shut down nuclear power plants, but three years of rising costs and carbon dioxide emissions are forcing it to reverse course.
A startup, Halotechnics, is building a pilot electricity storage system that will use molten salt.
ARPA-E faces a tricky mandate—invest in risky technologies that no one else wants to fund, while still showing results.
Software is taking over cars. But it may be a while before it can be updated without a trip to the dealer.
A factory that takes in raw materials and produces finished battery packs could lower costs for the most expensive part of an EV.
The company has managed the nearly impossible for a solar startup over the last few years: it is still in business.
The electric car company’s CTO explains what’s going on under the hood.